@article{ZNSL_1996_235_a8,
     author = {M. V. Babich and L. A. Bordag},
     title = {Qualitative investigation of the three phase solutions of {sine-Laplace} equation},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {199--216},
     publisher = {mathdoc},
     volume = {235},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1996_235_a8/}
}