@article{DAN_1976_230_5_a1,
     author = {N. B. Engibaryan},
     title = {Some factorization theorems for integral operators},
     journal = {Doklady Akademii Nauk},
     pages = {1021--1024},
     publisher = {mathdoc},
     volume = {230},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a1/}
}