@article{TMF_1997_111_3_a4,
     author = {V. F. Kovalev},
     title = {Renormgroup symmetries in problems of nonlinear geometrical optics},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {369--388},
     publisher = {mathdoc},
     volume = {111},
     number = {3},
     year = {1997},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1997_111_3_a4/}
}