@article{DE_1992_28_2_a9,
     author = {N. N. Lebedev and I. P. Skal'skaja},
     title = {Expansion of an arbitrary function in a series in squares of {Legendre} polynomials},
     journal = {Differencialʹnye uravneni\^a},
     pages = {262--270},
     publisher = {mathdoc},
     volume = {28},
     number = {2},
     year = {1992},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1992_28_2_a9/}
}