@article{TMF_1995_103_1_a12,
     author = {A. B. Shabat},
     title = {On the {Laplace--Darboux} theory of transformations},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {170--175},
     publisher = {mathdoc},
     volume = {103},
     number = {1},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1995_103_1_a12/}
}