@article{TMF_2003_137_1_a9,
     author = {P. R. Gordoa},
     title = {Algebraic and {Differential} {Nonlinear} {Superposition} {Formulas}},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {87--96},
     publisher = {mathdoc},
     volume = {137},
     number = {1},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2003_137_1_a9/}
}