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@article{IVM_1972_9_a14, author = {A. M. Skryago}, title = {On a~problem of {A.\,D.~Wallace} on the structure of semigroups on spheres}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {99--108}, publisher = {mathdoc}, number = {9}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1972_9_a14/} }
A. M. Skryago. On a~problem of A.\,D.~Wallace on the structure of semigroups on spheres. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1972), pp. 99-108. http://geodesic.mathdoc.fr/item/IVM_1972_9_a14/