%0 Journal Article %A I. V. Videnskii %T On the zeros of the derivative of a~rational function and coinvariant subspaces for the shift operator on the Bergman space %J Zapiski Nauchnykh Seminarov POMI %D 2001 %P 26-33 %V 282 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_2001_282_a2/ %G ru %F ZNSL_2001_282_a2