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[1]
EISENHART LP, RIEMANNIAN GEOMETRY, P189
[2]
HOPF, 1931, COMM MATH HELVET, V3, P209
[3]
Hopf H., 1932, JAHRESBER DTSCH MATH, V41, P209
[4]
TANNERY J, INTRO THEORIE FUNCTI, V2, P437
[6]
[No title captured]