Geodesic
Generalized Witt groups
Matematičeskie zametki, Tome 13 (1973) no. 3, pp. 419-426.

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In this paper we construct a functor from the category of one-dimensional commutative formal groups to the category of topological Abelian groups. For a multiplicative formal group, this function is the usual Witt functor. We study certain properties of the constructed functor. This functor is then used to describe multiplicative operations in the theory of unitary cobordisms. 
@article{MZM_1973_13_3_a10,
     author = {B. A. Dubrovin},
     title = {Generalized {Witt} groups},
     journal = {Matemati\v{c}eskie zametki},
     pages = {419--426},
     publisher = {mathdoc},
     volume = {13},
     number = {3},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1973_13_3_a10/}
}
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B. A. Dubrovin. Generalized Witt groups. Matematičeskie zametki, Tome 13 (1973) no. 3, pp. 419-426. http://geodesic.mathdoc.fr/item/MZM_1973_13_3_a10/