%0 Journal Article %A I. A. Makarov %T Extension of the applicability of formulas to negative values of parameters of equations with singular coefficients %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1978 %P 87-95 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1978_5_a10/ %G ru %F IVM_1978_5_a10