@article{IVM_2005_4_a7,
     author = {K. B. Sabitov and M. F. Mugafarov},
     title = {Extremal properties of solutions of the {Tricomi} difference problem for a difference system of equations of mixed type and their applications},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {56--69},
     publisher = {mathdoc},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2005_4_a7/}
}