共 20 条
[1]
BLISS GA, 1946, LECTURES CALCULUS VA
[3]
ANGULAR MEASURE AND INTEGRAL CURVATURE
[J].
CANADIAN JOURNAL OF MATHEMATICS-JOURNAL CANADIEN DE MATHEMATIQUES,
1949, 1 (03)
:279-296
[4]
BUSEMANN H, 1942, METRIC METHODS FINSL
[5]
Cartan E., 1946, LECONS GEOMETRIE ESP, V2nd revised ed.
[6]
Cohn-Vossen S., 1935, COMPOS MATH, V2, P69
[7]
HADAMARD J, 1898, J MATH PURE APPL, V4, P27
[8]
Hausdorff F., 1927, MENGENLEHRE
[9]
Hedlund G. A., 1939, B AM MATH SOC, V45, P241, DOI 10.1090/S0002-9904-1939-06945-0