%0 Journal Article %A A. T. Il'ichev %T The Sturm--Liouville problem for stationary axisymmetric gravitational fields %J Doklady Akademii Nauk %D 1986 %P 67-71 %V 291 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1986_291_1_a15/ %G ru %F DAN_1986_291_1_a15