@article{SM_2007_198_5_a1,
     author = {G. A. Grigoryan},
     title = {Special factorization of a~non-invertible integral {Fredholm
}},
     journal = {Sbornik. Mathematics},
     pages = {627--637},
     publisher = {mathdoc},
     volume = {198},
     number = {5},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2007_198_5_a1/}
}