中国科学院数学与系统科学研究院期刊网
A PROBLEM WITH VARIABLE END POINTS IN THE CALCULUS OF VARIATIONS
胡坤升
A PROBLEM WITH VARIABLE END POINTS IN THE CALCULUS OF VARIATIONS
KunSheng HU
数学学报 . 1936, (1): 1 -14 .  DOI: 10.12386/A1936sxxb0001