%0 Journal Article %A V. V. Dubrovskii %A A. I. Sedov %T An estimate for the difference of spectral functions of Gegenbauer-type operators in the norm of $L_q$ %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1999 %P 20-25 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1999_8_a2/ %G ru %F IVM_1999_8_a2