An article, written by Tamas Biro, has been published in the October 2020 issue of the Open Access Government journal about the research of entropy formulas. Since this paper is for a general audience, the formulas themselves appeared in separate publications.
The article is on the page 158: edition.pagesuite-professional.co.uk
About the formules:
https://www.mdpi.com/1099-4300/22/8/879
http://www.noemiderzsy.com/uploads/1/0/2/2/102269884/scaling_in_income_…
https://www.sciencedirect.com/science/article/pii/S0378437118301547?via…
