%0 Journal Article %A V. E. Firstov %T A Special Matrix Transformation Semigroup of Primitive Pairs and the Genealogy of Pythagorean Triples %J Matematičeskie zametki %D 2008 %P 281-299 %V 84 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_2008_84_2_a9/ %G ru %F MZM_2008_84_2_a9