@article{PIM_1997_N_S_61_75_a14,
     author = {Boris A. Rosenfeld and Nadezhda E. Maryukova},
     title = {Surfaces of {Constant} {Curvature} and {Geometric} {Interpretations} of the {Klein-gordon,} {Sine-gordon} and {Sinh-gordon} {Equations}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {119 },
     publisher = {mathdoc},
     volume = {_N_S_61},
     number = {75},
     year = {1997},
     zbl = {0885.53015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1997_N_S_61_75_a14/}
}