Geodesic
Two-valued formal groups. Algebraic theory and applications to cobordism.~II
Izvestiya. Mathematics , Tome 10 (1976) no. 2, pp. 271-308

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In this paper is described a homological method for classifying two-valued formal groups, yielding a computation of the universal two-valued formal group of first type. It is also proved that if the ground ring has no nilpotent elements, then any two-valued formal group over it of the second type is the square of a one-dimensional formal group. Bibliography: 9 titles. 
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     author = {V. M. Buchstaber},
     title = {Two-valued formal groups. {Algebraic} theory and applications to {cobordism.~II}},
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V. M. Buchstaber. Two-valued formal groups. Algebraic theory and applications to cobordism.~II. Izvestiya. Mathematics , Tome 10 (1976) no. 2, pp. 271-308. http://geodesic.mathdoc.fr/item/IM2_1976_10_2_a3/