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@article{DAN_1957_113_5_a5, author = {M. G. Krein}, title = {On a continuous analogue of a {Christoffel} formula from the theory of orthogonal polynomials}, journal = {Doklady Akademii Nauk}, pages = {970--973}, publisher = {mathdoc}, volume = {113}, number = {5}, year = {1957}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_5_a5/} }
M. G. Krein. On a continuous analogue of a Christoffel formula from the theory of orthogonal polynomials. Doklady Akademii Nauk, Tome 113 (1957) no. 5, pp. 970-973. http://geodesic.mathdoc.fr/item/DAN_1957_113_5_a5/