@article{SM_1995_82_2_a6,
     author = {V. V. Pospelov},
     title = {On the theory of singular expansion in a~tensor product of {Hilbert} spaces},
     journal = {Sbornik. Mathematics},
     pages = {357--364},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_82_2_a6/}
}