@article{ZNSL_1986_156_a11,
     author = {Ya. V. Kurylev},
     title = {``Quasiphoton'' on active {media.~II.} {Example:} one-ditimensional wave equation with a~small retarding argument},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {136--142},
     publisher = {mathdoc},
     volume = {156},
     year = {1986},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_156_a11/}
}