@article{SM_1990_66_2_a1,
     author = {A. Ch. Chigogidze},
     title = {$n$-shapes and $n$-cohomotopy groups of compacta},
     journal = {Sbornik. Mathematics},
     pages = {329--342},
     year = {1990},
     volume = {66},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_66_2_a1/}
}