@article{DAN_1972_206_2_a2,
     author = {I. Gohberg and J. Laiterer},
     title = {On the factorization of continuous operator functions relative to a contour in {Banach} algebras},
     journal = {Doklady Akademii Nauk},
     pages = {273--276},
     publisher = {mathdoc},
     volume = {206},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_206_2_a2/}
}