中国科学院数学与系统科学研究院期刊网
The Existence of Triple Classical Solutions to Impulsive Problems with Small Non-autonomous Perturbations
Jian LIU, Zeng Qin ZHAO, Wen Guang YU
Acta Mathematica Sinica, Chinese Series . 2019, (3): 441 -448 .  DOI: 10.12386/A2019sxxb0041