@article{MABA_1990_4_2_a2,
     author = {Krasimir G. Ianakiev},
     title = {Scattering for {Nonlinear} {Wave} {Equation} with {Small} {Initial} {Data}},
     journal = {Mathematica balkanica},
     pages = {139},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1990},
     url = {http://geodesic.mathdoc.fr/item/MABA_1990_4_2_a2/}
}