@article{DAN_1977_234_3_a10,
     author = {R. S. Saks},
     title = {On the theory of systems of one-dimensional singular integrodifferential equations reducible to systems of normal type},
     journal = {Doklady Akademii Nauk},
     pages = {544--547},
     publisher = {mathdoc},
     volume = {234},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_3_a10/}
}