摘要： In this paper we establish Levin type comparison theorems for certain second order differential equations. The results obtained here generalize and extend some of the earlier ones related to the Levin's comparison theorems.
B. G. Pachpatte. ON LEVIN TYPE COMPARISON THEOREMS FOR CERTAIN SECOND ORDER DIFFERENTIAL EQUATIONS[J]. 数学物理学报(英文版), 1997, 17(1): 51-55.
B. G. Pachpatte. ON LEVIN TYPE COMPARISON THEOREMS FOR CERTAIN SECOND ORDER DIFFERENTIAL EQUATIONS[J]. Acta mathematica scientia,Series B, 1997, 17(1): 51-55.