Geodesic
ON THE GROUP OF SEPARABLE QUADRATIC ALGEBRAS AND STACKS
Glasgow mathematical journal, Tome 61 (2019) no. 1, pp. 151-167

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DOI

The aim of this paper is to study the group of isomorphism classes of torsors of finite flat group schemes of rank 2 over a commutative ring R. This, in particular, generalizes the group of quadratic algebras (free or projective), which is especially well studied. Our approach, however, yields new results even in this case. 
PIRASHVILI, ILIA. ON THE GROUP OF SEPARABLE QUADRATIC ALGEBRAS AND STACKS. Glasgow mathematical journal, Tome 61 (2019) no. 1, pp. 151-167. doi: 10.1017/S0017089518000150
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     title = {ON {THE} {GROUP} {OF} {SEPARABLE} {QUADRATIC} {ALGEBRAS} {AND} {STACKS}},
     journal = {Glasgow mathematical journal},
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     year = {2019},
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     doi = {10.1017/S0017089518000150},
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