@article{SM_1978_34_1_a4,
     author = {V. I. Sedenko},
     title = {On the normal form of nonlinear partial differential equations on the real axis},
     journal = {Sbornik. Mathematics},
     pages = {111--117},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1978},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1978_34_1_a4/}
}