@article{IM2_1973_7_1_a9,
     author = {B. S. Pavlov},
     title = {Factorization of a~scattering matrix and the serial structure of its roots},
     journal = {Izvestiya. Mathematics },
     pages = {215--245},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1973},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1973_7_1_a9/}
}