%0 Journal Article %A N. N. Lebedev %A I. P. Skal'skaja %T Expansion of an arbitrary function in a series in squares of Legendre polynomials %J Differencialʹnye uravneniâ %D 1992 %P 262-270 %V 28 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1992_28_2_a9/ %G ru %F DE_1992_28_2_a9