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@article{IVM_1962_3_a18, author = {A. I. Cheremisin}, title = {Betweenness rings}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {158--163}, publisher = {mathdoc}, number = {3}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1962_3_a18/} }
A. I. Cheremisin. Betweenness rings. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1962), pp. 158-163. http://geodesic.mathdoc.fr/item/IVM_1962_3_a18/