Thank you very much for your answer to my question, I investigated your answer and this answer is enough for now, but associated with other versions of the FP equation will give you information, see you as soon as possible...
I understand that you are interested in the derivation of the Fokker-Planck equation and its relation to the Langevin description. From a physical standpoint, van Kampen's book "Stochastic Processes in Physics and Chemistry" is a key text. I would definitely recommend reading it to anyone starting a career in statistical physics.