@article{FAA_1990_24_1_a16,
     author = {S. L. Tabachnikov},
     title = {Two remarks on the asymptotic {Hopf} invariant},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {84--85},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1990_24_1_a16/}
}