@article{VSGTU_2006_43_43_a5,
     author = {L. B. Mironova},
     title = {On characteristic problem for a system with double higher partial derivatives},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {31--37},
     year = {2006},
     volume = {43},
     number = {43},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2006_43_43_a5/}
}