Wang, Yi Qian, Boundedness of Solutions in Asymmetric Oscillations via the Twist Theorem, Acta mathematica Sinica. English series (Print) , 17(2), 2000, pp. 313-318
In this paper we consider the boundedness of all the solutions for the equation x * ax *bx = f(t) is a smooth 2-periodic function, a and b are positive constants (ab).