@article{MABA_1994_8_2-3_a8,
     author = {Svetla Spirova},
     title = {On a {Boundary,} {Value} {Problem} for an {Equation} of {Mixed} {Type}},
     journal = {Mathematica balkanica},
     pages = {221},
     publisher = {mathdoc},
     volume = {8},
     number = {2-3},
     year = {1994},
     url = {http://geodesic.mathdoc.fr/item/MABA_1994_8_2-3_a8/}
}