diff --git a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/TGeoManager.kt b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/TGeoManager.kt
index acf4d712..3b3eecf5 100644
--- a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/TGeoManager.kt
+++ b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/TGeoManager.kt
@@ -1,15 +1,9 @@
 package ru.mipt.npm.root
 
-import kotlinx.serialization.*
-import kotlinx.serialization.descriptors.SerialDescriptor
-import kotlinx.serialization.encoding.Decoder
-import kotlinx.serialization.encoding.Encoder
-import kotlinx.serialization.json.Json
-import kotlinx.serialization.json.JsonDecoder
-import kotlinx.serialization.json.JsonObject
-import kotlinx.serialization.modules.SerializersModule
-import kotlinx.serialization.modules.polymorphic
-import kotlinx.serialization.modules.subclass
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.decodeFromJsonElement
 
 @Serializable
 @SerialName("TGeoManager")
@@ -26,113 +20,10 @@ public class TGeoManager : TNamed() {
         /**
          * Load Json encoded TGeoManager
          */
-        public fun decodeFromJson(jsonObject: JsonObject): TGeoManager = TODO()
+        public fun decodeFromJson(jsonElement: JsonElement): TGeoManager =
+            rootJson().decodeFromJsonElement(jsonElement)
 
         public fun decodeFromString(string: String): TGeoManager =
-            Root().decodeFromString(serializer(), string)
+            rootJson().decodeFromString(serializer(), string)
     }
 }
-
-@OptIn(ExperimentalSerializationApi::class)
-private class RootJsonSerializer<T>(private val tSerializer: KSerializer<T>) : KSerializer<T> {
-
-    private val refCache: HashMap<UInt, TObject> = HashMap()
-
-
-    override val descriptor: SerialDescriptor get() = tSerializer.descriptor
-
-
-    override fun deserialize(decoder: Decoder): T {
-        val input =  decoder as JsonDecoder
-        val element = input.decodeJsonElement()
-        return input.json.decodeFromJsonElement(tSerializer, transformDeserialize(element))
-    }
-
-    override fun serialize(encoder: Encoder, value: T) {
-        tSerializer.serialize(encoder, value)
-    }
-
-    override fun <T> decodeFromString(deserializer: DeserializationStrategy<T>, string: String): T {
-        val match = refRegex.matchEntire(string)
-        return if (match != null) {
-            //Do unref
-            val ref = match.value.toUIntOrNull() ?: error("Ref value is not a number")
-            val refValue = refCache[ref] ?: error("Reference $ref unresolved")
-            refValue as T //TODO research means to make it safe
-        } else {
-            val res = rootJson.decodeFromString(deserializer, string)
-            val uid = (res as? TObject)?.fUniqueID
-            if (uid != null && refCache[uid] == null) {
-                refCache[uid] = res
-            }
-            res
-        }
-    }
-
-
-    override fun <T> encodeToString(serializer: SerializationStrategy<T>, value: T): String =
-        rootJson.encodeToString(serializer, value)
-
-    companion object {
-        val refRegex = """\{\s*"${"\\$"}ref"\s*:\s*(\d*)}""".toRegex()
-
-        val rootSerializersModule = SerializersModule {
-            polymorphic(TGeoShape::class) {
-                subclass(TGeoBBox.serializer())
-                subclass(TGeoCompositeShape.serializer())
-                subclass(TGeoXtru.serializer())
-                subclass(TGeoTube.serializer())
-                subclass(TGeoTubeSeg.serializer())
-                subclass(TGeoShapeAssembly.serializer())
-            }
-
-            polymorphic(TGeoMatrix::class) {
-                subclass(TGeoIdentity.serializer())
-                subclass(TGeoHMatrix.serializer())
-                subclass(TGeoTranslation.serializer())
-                subclass(TGeoRotation.serializer())
-                subclass(TGeoCombiTrans.serializer())
-            }
-
-            polymorphic(TObject::class) {
-                subclass(TGeoBBox.serializer())
-                subclass(TGeoCompositeShape.serializer())
-                subclass(TGeoXtru.serializer())
-                subclass(TGeoTube.serializer())
-                subclass(TGeoTubeSeg.serializer())
-                subclass(TGeoShapeAssembly.serializer())
-
-                subclass(TGeoIdentity.serializer())
-                subclass(TGeoHMatrix.serializer())
-                subclass(TGeoTranslation.serializer())
-                subclass(TGeoRotation.serializer())
-                subclass(TGeoCombiTrans.serializer())
-
-                subclass(TGeoMaterial.serializer())
-                subclass(TGeoMixture.serializer())
-
-                subclass(TGeoMedium.serializer())
-
-                subclass(TGeoNode.serializer())
-                subclass(TGeoNodeMatrix.serializer())
-                subclass(TGeoVolume.serializer())
-                subclass(TGeoVolumeAssembly.serializer())
-            }
-            polymorphic(TGeoNode::class, TGeoNode.serializer()) {
-                subclass(TGeoNodeMatrix.serializer())
-            }
-            polymorphic(TGeoVolume::class, TGeoVolume.serializer()) {
-                subclass(TGeoVolumeAssembly.serializer())
-            }
-        }
-
-        val rootJson: Json = Json {
-            encodeDefaults = true
-            ignoreUnknownKeys = true
-            classDiscriminator = "_typename"
-            serializersModule = rootSerializersModule
-        }
-
-    }
-
-}
diff --git a/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/rootJson.kt b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/rootJson.kt
new file mode 100644
index 00000000..f0b25d18
--- /dev/null
+++ b/cern-root-loader/src/commonMain/kotlin/ru/mipt/npm/root/rootJson.kt
@@ -0,0 +1,107 @@
+package ru.mipt.npm.root
+
+import kotlinx.serialization.KSerializer
+import kotlinx.serialization.descriptors.SerialDescriptor
+import kotlinx.serialization.encoding.Decoder
+import kotlinx.serialization.encoding.Encoder
+import kotlinx.serialization.json.*
+import kotlinx.serialization.modules.PolymorphicModuleBuilder
+import kotlinx.serialization.modules.SerializersModule
+import kotlinx.serialization.modules.polymorphic
+import kotlinx.serialization.modules.subclass
+
+
+private typealias  RefCache = MutableList<TObject>
+
+private class RootJsonSerializer<T : TObject>(
+    private val refCache: RefCache,
+    private val tSerializer: KSerializer<T>
+) : KSerializer<T> {
+
+    override val descriptor: SerialDescriptor get() = tSerializer.descriptor
+
+    override fun deserialize(decoder: Decoder): T {
+        val input = decoder as JsonDecoder
+        val element = input.decodeJsonElement()
+        val refId = (element as? JsonObject)?.get("\$ref")?.jsonPrimitive?.int
+        return if (refId != null) {
+            //Do unref
+            val refValue = refCache[refId]
+            refValue as T //TODO research means to make it safe
+        } else {
+            val res = input.json.decodeFromJsonElement(tSerializer, element)
+            //val uid = res.fUniqueID
+            refCache.add(res)
+            res
+        }
+    }
+
+    override fun serialize(encoder: Encoder, value: T) {
+        tSerializer.serialize(encoder, value)
+    }
+
+}
+
+private fun <T : TObject> KSerializer<T>.unref(refCache: RefCache): RootJsonSerializer<T> =
+    RootJsonSerializer(refCache, this)
+
+
+private fun PolymorphicModuleBuilder<TGeoShape>.shapes(refCache: RefCache) {
+    subclass(TGeoBBox.serializer().unref(refCache))
+    subclass(TGeoCompositeShape.serializer().unref(refCache))
+    subclass(TGeoXtru.serializer().unref(refCache))
+    subclass(TGeoTube.serializer().unref(refCache))
+    subclass(TGeoTubeSeg.serializer().unref(refCache))
+    subclass(TGeoShapeAssembly.serializer().unref(refCache))
+}
+
+private fun PolymorphicModuleBuilder<TGeoMatrix>.matrices(refCache: RefCache) {
+    subclass(TGeoIdentity.serializer().unref(refCache))
+    subclass(TGeoHMatrix.serializer().unref(refCache))
+    subclass(TGeoTranslation.serializer().unref(refCache))
+    subclass(TGeoRotation.serializer().unref(refCache))
+    subclass(TGeoCombiTrans.serializer().unref(refCache))
+}
+
+/**
+ * Create an instance of Json with unfolding Root references. This instance could not be reused because of the cache.
+ */
+internal fun rootJson(): Json {
+    val refCache = ArrayList<TObject>(4096)
+    return Json {
+        encodeDefaults = true
+        ignoreUnknownKeys = true
+        classDiscriminator = "_typename"
+        serializersModule = SerializersModule {
+            polymorphic(TGeoShape::class) {
+                default { TGeoBBox.serializer().unref(refCache) }
+                shapes(refCache)
+            }
+
+            polymorphic(TGeoMatrix::class) {
+                matrices(refCache)
+            }
+
+            polymorphic(TObject::class) {
+                shapes(refCache)
+                matrices(refCache)
+
+                subclass(TGeoMaterial.serializer().unref(refCache))
+                subclass(TGeoMixture.serializer().unref(refCache))
+
+                subclass(TGeoMedium.serializer().unref(refCache))
+
+                subclass(TGeoNode.serializer().unref(refCache))
+                subclass(TGeoNodeMatrix.serializer().unref(refCache))
+                subclass(TGeoVolume.serializer().unref(refCache))
+                subclass(TGeoVolumeAssembly.serializer().unref(refCache))
+            }
+            polymorphic(TGeoNode::class, TGeoNode.serializer().unref(refCache)) {
+                subclass(TGeoNodeMatrix.serializer().unref(refCache))
+            }
+            polymorphic(TGeoVolume::class, TGeoVolume.serializer().unref(refCache)) {
+                subclass(TGeoVolumeAssembly.serializer().unref(refCache))
+            }
+        }
+    }
+}
\ No newline at end of file