@article{SM_1975_25_2_a4,
     author = {A. V. Marchenko},
     title = {Selfadjoint differential operators with an~infinite number of independent variables},
     journal = {Sbornik. Mathematics},
     pages = {259--275},
     publisher = {mathdoc},
     volume = {25},
     number = {2},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1975_25_2_a4/}
}