@article{INTO_2018_152_a4,
     author = {A. V. Zhiber and A. M. Yur'eva},
     title = {On a {Certain} {Class} of {Hyperbolic} {Equations} with {Second-order} {Integrals}},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {46--52},
     publisher = {mathdoc},
     volume = {152},
     year = {2018},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2018_152_a4/}
}