@article{ZNSL_1987_161_a5,
     author = {M. A. Sall'},
     title = {$L-A$ pairs with rational dependence on spectral parameters. {Darboux} transformation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {72--75},
     publisher = {mathdoc},
     volume = {161},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_161_a5/}
}