@article{MZM_1991_50_5_a22,
     author = {V. P. Shutyaev},
     title = {Perturbation method for a weakly nonlinear hyperbolic first order problem},
     journal = {Matemati\v{c}eskie zametki},
     pages = {156--158},
     publisher = {mathdoc},
     volume = {50},
     number = {5},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1991_50_5_a22/}
}