@article{IVM_1998_7_a5,
     author = {A. Yu. Senitskiy},
     title = {On the integrability of the wave equation with variable coefficients},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {39--46},
     publisher = {mathdoc},
     number = {7},
     year = {1998},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1998_7_a5/}
}