Geodesic
The crossed product theorem for projective Schur algebras
Glasgow mathematical journal, Tome 43 (2001) no. 1, pp. 135-143

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The projective Schur group of a commutative ring was introduced by Lorenz and Opolka. It was revived by Nelis and Van Oystaeyen, and later by Aljadeff and Sonn. In this paper we study the intriguing question that there seems to be no adequate version of the crossed product theorem for the projective Schur group. We present a radical group R(k) (k a field) situated between the Schur group and the projective Schur group, and we prove the crossed product theorem for R(k). 
Choi, E.; Lee, H. The crossed product theorem for projective Schur algebras. Glasgow mathematical journal, Tome 43 (2001) no. 1, pp. 135-143. doi: 10.1017/S0017089501010138
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