@article{IVM_1997_9_a7,
     author = {I. Kh. Sabitov},
     title = {An integral analog of the {Darboux} equations for immersions of two-dimensional metrics},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {49--56},
     publisher = {mathdoc},
     number = {9},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1997_9_a7/}
}