diff --git a/BPM/notation/BPMN/docflow/readme.md b/BPM/notation/BPMN/docflow/readme.md
index 9e9c850b..a37ef930 100644
--- a/BPM/notation/BPMN/docflow/readme.md
+++ b/BPM/notation/BPMN/docflow/readme.md
@@ -1 +1,8 @@
 ### docflow
+#### example Data Association + Association
+- https://mainthing.ru/ru/item/434/
+- https://www.visual-paradigm.com/guide/bpmn/how-to-use-data-objects-in-bpmn/
+- https://www.edumax.pro/blog/how-to-model-data-in-bpmn
+
+### doc Data Object 
+- BPEL Properties https://sparxsystems.com/resources/user-guides/15.1/model-domains/bpmn-models.pdf стр.38