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@article{AL_1974_13_4_a4, author = {S. V. Pchelintsev}, title = {A free $(-1,1)$-algebra with two generators}, journal = {Algebra i logika}, pages = {425--449}, publisher = {mathdoc}, volume = {13}, number = {4}, year = {1974}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1974_13_4_a4/} }
S. V. Pchelintsev. A free $(-1,1)$-algebra with two generators. Algebra i logika, Tome 13 (1974) no. 4, pp. 425-449. http://geodesic.mathdoc.fr/item/AL_1974_13_4_a4/