Geodesic
Approximation of piecewise-smooth functions by the eigenelements of two Sturm--Liouville problems
Doklady Akademii Nauk, Tome 250 (1980) no. 3, pp. 573-577.

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     author = {V. V. Smelov},
     title = {Approximation of piecewise-smooth functions by the eigenelements of two {Sturm--Liouville} problems},
     journal = {Doklady Akademii Nauk},
     pages = {573--577},
     publisher = {mathdoc},
     volume = {250},
     number = {3},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_250_3_a15/}
}
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V. V. Smelov. Approximation of piecewise-smooth functions by the eigenelements of two Sturm--Liouville problems. Doklady Akademii Nauk, Tome 250 (1980) no. 3, pp. 573-577. http://geodesic.mathdoc.fr/item/DAN_1980_250_3_a15/