@article{ZNSL_2012_398_a5,
     author = {E. Sh. Gutshabash},
     title = {Moutard transformation and its application to some physical {problems.~I.} {The} case of two independent variables},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {100--124},
     publisher = {mathdoc},
     volume = {398},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2012_398_a5/}
}