%0 Journal Article %A M. V. Babich %A L. A. Bordag %T Qualitative investigation of the three phase solutions of sine-Laplace equation %J Zapiski Nauchnykh Seminarov POMI %D 1996 %P 199-216 %V 235 %I mathdoc %U http://geodesic.mathdoc.fr/item/ZNSL_1996_235_a8/ %G en %F ZNSL_1996_235_a8