Geodesic
Two-valued formal groups. Algebraic theory and applications to cobor\-dism.~I
Izvestiya. Mathematics , Tome 9 (1975) no. 5, pp. 987-1006

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An axiomatic definition is given for the notion of a two-valued formal group. The coalgebra and the generalized translation associated with a two-valued formal group are then defined and studied. A complete classification is obtained for two-valued formal groups over $Q$-algebras. Bibliography: 11 titles. 
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     author = {V. M. Buchstaber},
     title = {Two-valued formal groups. {Algebraic} theory and applications to {cobor\-dism.~I}},
     journal = {Izvestiya. Mathematics },
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     volume = {9},
     number = {5},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1975_9_5_a3/}
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V. M. Buchstaber. Two-valued formal groups. Algebraic theory and applications to cobor\-dism.~I. Izvestiya. Mathematics , Tome 9 (1975) no. 5, pp. 987-1006. http://geodesic.mathdoc.fr/item/IM2_1975_9_5_a3/