%0 Journal Article %A S. N. Tronin %T Products in categories of fractions and universal inversion of homomorphisms %J Sbornik. Mathematics %D 1997 %P 1521-1541 %V 188 %N 10 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1997_188_10_a4/ %G en %F SM_1997_188_10_a4