@article{ZNSL_1996_234_a7,
     author = {D. A. Korotkin},
     title = {On some integrable cases in surface theory},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {65--124},
     year = {1996},
     volume = {234},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_234_a7/}
}