Nevanlinna theory is part (most) of value distribution theory of holomorphic functions There are many books where you can find abaout Nevannlina theory.. I recomend you text where you can lfind about Nevannlina Theory, which you can find; on the following web sit: https://math.berkeley.edu/~vojta/cime/cimebeamer.pdf
I recommend you contact with the professor A.Prykarpatski https://www.researchgate.net/profile/Anatolij_Prykarpatski. He is a specialist in the application mathematics to physics.
Nevanlinna theory is part (most) of value distribution theory of holomorphic functions There are many books where you can find abaout Nevannlina theory.. I recomend you text where you can lfind about Nevannlina Theory, which you can find; on the following web sit: https://math.berkeley.edu/~vojta/cime/cimebeamer.pdf