Referring to ImageJ/ObjectJ macro Tree rings

Hi all!

I’m currently working on my thesis, where I’ve used ImageJ plugin ObjectJ (macro “Tree rings”) to analyse growth patterns in salmon scales. The developers should off course get their tribute and my question is, does anyone know how to refer to this plugin/macro in a correct manor?

https://sils.fnwi.uva.nl/bcb/objectj/7a-Examples.html

Best,
Ulrika