Uniqueness of limit cycles for Liénard systems. A generalization of Massera's theorem
Consider the system \[ {dx\over dt}= k(y),\quad {dy\over dt}=- f(x,y) k(y)- h(x).\tag{\(*\)} \] The author derives conditions on the functions \(k\), \(f\), \(h\) such that if \((*)\) has a limit cycle, it is unique and stable.
scientific article; zbMATH DE number 6391406