L2SS-245: add references to polling docs

devices/test/devices/automatic_polling_performance_test/Tango_Controls-Automatic_polling_performance_test.md

@@ -5,6 +5,16 @@ The highest polling rate among all the attributes in all devices determines how
 
 We investigate whether using more polling threads can alleviate the situation for a single or multiple devices that run in the same DS.
 
+# References
+
+Please refer to the reference documents for in-depth information about the automatic polling and how to configure a DS to use a dedicated thread per device for polling.
+
+[Attribute polling in Tango Controls](https://tango-controls.readthedocs.io/en/latest/development/device-api/ds-guideline/device-server-guidelines.html#tango-polling-mechanism)
+
+[Device polling in Tango Controls](https://tango-controls.readthedocs.io/en/latest/development/device-api/device-polling.html)
+
+[Configuring a DS to use per Device threads in polling](https://tango-controls.readthedocs.io/en/latest/development/advanced/reference.html#dserver-class-device-properties)
+
 # Test set-up
 
 - Two devices run in the same DS.