@article{MAT_1958_2_6_a1,
     author = {N. E. Steenrod},
     title = {Cohomology operations, and obstructions to extending continuous functions},
     journal = {Matematika},
     pages = {11--48},
     publisher = {mathdoc},
     volume = {2},
     number = {6},
     year = {1958},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MAT_1958_2_6_a1/}
}