@article{ZVMMF_2002_42_12_a8,
     author = {S. A. Varentsova and V. A. Trofimov},
     title = {Invariants of nonlinear propagation of femtosecond laser pulses through a medium with non-stationary response},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1831--1835},
     publisher = {mathdoc},
     volume = {42},
     number = {12},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_2002_42_12_a8/}
}