@article{SIGMA_2007_3_a53,
     author = {Alexander Sakhnovich},
     title = {B\"acklund{\textendash}Darboux {Transformation} for {Non-Isospectral} {Canonical} {System} and {Riemann{\textendash}Hilbert} {Problem}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2007},
     volume = {3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2007_3_a53/}
}