I'm writing my M.Sc. Thesis (my username gave that away).
I do not usually have issues writing in formal/scientific English, but this sentence sounds to me too long; however I cannot find how to improve it or at least add commas.
The work carried out in [REF] defines the inlet values from averages over the periods of time when they appear the most stable.
Do you understand it, and if not how should it be modified?