@article{FAA_1978_12_4_a8,
     author = {\'E. G. Gismann},
     title = {Product formulas for the {Nilsen} numbers of bundle maps},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {81--82},
     year = {1978},
     volume = {12},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1978_12_4_a8/}
}