Classification of the mappings of an (n+1)-dimensional sphere into a polyhedron K [subscript n] whose fundamental group and Betti groups of dimensions 2,..., n-1 are trivial by L. S. Pontri︠a︡gin

Classification of the mappings of an (n+1)-dimensional sphere into a polyhedron K [subscript n] whose fundamental group and Betti groups of dimensions 2,..., n-1 are trivial