中国科学院数学与系统科学研究院期刊网
TOPOLOGICAL STRUCTURE OF INTEGRAL CURVES OF THE DIFFERENTIAL EQUATION y′= a_0x~n+a_1x~(n-1)y+…+a_ny~n/b_ox~n+b_1x~(n-1)y+…+b_ny~n
李森林
Acta Mathematica Sinica, Chinese Series . 1960, (1): 1 -21 .  DOI: 10.12386/A1960sxxb0001