Ok. Actually his email seems not to be on the web. He is probably : https://nl.linkedin.com/in/bal%C3%A1zs-mesz%C3%A9na-35487710b but one needs a account to be able to communicate with him. He did a PhD thesis, then he left physics.
Anyway, it is fine. No worries. I can't be sure if the correct formulas were implemented. But it is fine. I may rewrite the program once time available, in other language, since I don't master Mathematica language.
I'm afraid I do not know. I would hope a web search might turn it up but beyond that I have no other suggestions.
Thank you. How to find his email ?
This is a domain-specific question, not, as best I can tell, anything to do with the Wolfram Language per se. Probably best to address it to the author of that Demonstration, unless someone on the forum happens to have answers.
