@article{RM_1988_43_5_a8,
     author = {L. \`E. Bembiev},
     title = {Singularities of~waves of~ surface type},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {211--212},
     publisher = {mathdoc},
     volume = {43},
     number = {5},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1988_43_5_a8/}
}