On retracts and retractions of free modules over graded rings
Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (2007), pp. 71-75.

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S. N. Tronin. On retracts and retractions of free modules over graded rings. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 7 (2007), pp. 71-75. http://geodesic.mathdoc.fr/item/IVM_2007_7_a8/

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