Geodesic
Two remarks on the asymptotic Hopf invariant
Funkcionalʹnyj analiz i ego priloženiâ, Tome 24 (1990) no. 1, pp. 84-85 
S. L. Tabachnikov. Two remarks on the asymptotic Hopf invariant. Funkcionalʹnyj analiz i ego priloženiâ, Tome 24 (1990) no. 1, pp. 84-85. http://geodesic.mathdoc.fr/item/FAA_1990_24_1_a16/
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