@article{MAT_1957_1_1_a1,
     author = {P. J. Hilton},
     title = {On the homotopy groups of the union of spheres},
     journal = {Matematika},
     pages = {19--36},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1957_1_1_a1/}
}