中国科学院数学与系统科学研究院期刊网
KOSCHMIEDER INVARIANT AND THE ASSOCIATE DIFFERENTIAL EQUATION OF A MINIMAL HYPERSURFACE IN A REGULAR CARTAN SPACE
蘇步青
Acta Mathematica Sinica, Chinese Series . 1956, (3): 374 -388 .  DOI: 10.12386/A1956sxxb0029