Geodesic
Projective and generating modules over the ring of pseudorational numbers
Matematičeskie zametki, Tome 80 (2006) no. 3, pp. 437-448.

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The projective, flat, and generating modules over the ring of pseudorational numbers are described. For the projective modules, a complete independent system of invariants is constructed.
Keywords: module over the ring of pseudorational numbers, pseudorational numbers, projective module, generating module, flat module. 
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A. V. Tsarev. Projective and generating modules over the ring of pseudorational numbers. Matematičeskie zametki, Tome 80 (2006) no. 3, pp. 437-448. http://geodesic.mathdoc.fr/item/MZM_2006_80_3_a13/

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