VECTOR FIELDS ON THE NORMAL-SPHERE

[1] CARTAN H, 1950, CR HEBD ACAD SCI, V230, P425

[2] ECKMANN B, 1942, COMMENT MATH HELV, V15, P1

[3] Hopf H., 1935, FUND MATH, V25, P427

[4] HOPF H, 1941, COMMENT MATH HELV, V13, P219

[5] KIRCHHOFF A, 1948, C R ACAD PARIS, V223, P1258

[6] STEENROD N, 1957, TOPOLOGY FIBRE BUNDL

[7] PRODUCTS OF COCYCLES AND EXTENSIONS OF MAPPINGS [J]. ANNALS OF MATHEMATICS, 1947, 48 (02) : 290 - 320

[8] STIEFEL E, 1941, COMMENT MATH HELV, V13, P201

[9] THE (N + 2)ND HOMOTOPY GROUP OF THE N-SPHERE [J]. ANNALS OF MATHEMATICS, 1950, 52 (02) : 245 - 247

[10] Homotopy properties of the real orthogonal groups [J]. ANNALS OF MATHEMATICS, 1942, 43 : 132 - 146

[1] CARTAN H, 1950, CR HEBD ACAD SCI, V230, P425

[2] ECKMANN B, 1942, COMMENT MATH HELV, V15, P1

[3] Hopf H., 1935, FUND MATH, V25, P427

[4] HOPF H, 1941, COMMENT MATH HELV, V13, P219

[5] KIRCHHOFF A, 1948, C R ACAD PARIS, V223, P1258

[6] STEENROD N, 1957, TOPOLOGY FIBRE BUNDL

[7] PRODUCTS OF COCYCLES AND EXTENSIONS OF MAPPINGS [J]. ANNALS OF MATHEMATICS, 1947, 48 (02) : 290 - 320

[8] STIEFEL E, 1941, COMMENT MATH HELV, V13, P201

[9] THE (N + 2)ND HOMOTOPY GROUP OF THE N-SPHERE [J]. ANNALS OF MATHEMATICS, 1950, 52 (02) : 245 - 247

[10] Homotopy properties of the real orthogonal groups [J]. ANNALS OF MATHEMATICS, 1942, 43 : 132 - 146