Geodesic
$L-A$ pairs with rational dependence on spectral parameters. Darboux transformation
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 7, Tome 161 (1987), pp. 72-75 
M. A. Sall'. $L-A$ pairs with rational dependence on spectral parameters. Darboux transformation. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 7, Tome 161 (1987), pp. 72-75. http://geodesic.mathdoc.fr/item/ZNSL_1987_161_a5/
@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},
     year = {1987},
     volume = {161},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_161_a5/}
}
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Linear operators with rational depending on spectral parameters are considered. Results applied to the studing of some nonlinear equations.