%0 Journal Article %A P. I. Katsylo %T Rationality of fields of invariants of reducible representations of the group $\mathrm{SL}_2$ %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1984 %P 77-79 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1984_5_a20/ %G ru %F VMUMM_1984_5_a20