@article{ISU_2010_10_4_a6,
     author = {O. V. Lashtabega and A. N. Zarubin},
     title = {Tricomi problem for differential-difference equations of mixed type in the asymmetric field},
     journal = {Izvestiya of Saratov University. Mathematics. Mechanics. Informatics},
     pages = {41--51},
     publisher = {mathdoc},
     volume = {10},
     number = {4},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ISU_2010_10_4_a6/}
}