@article{SM_1986_55_1_a6,
     author = {N. K. Al'bov},
     title = {On a~criterion for solvability of {Fredholm} equations},
     journal = {Sbornik. Mathematics},
     pages = {113--119},
     publisher = {mathdoc},
     volume = {55},
     number = {1},
     year = {1986},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1986_55_1_a6/}
}