%0 Journal Article %A A. V. Astrelin %T An estimate for the degree of irreducible eigenpolynomials of a differential operator of a certain type %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1990 %P 75-77 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1990_5_a17/ %G ru %F VMUMM_1990_5_a17