@article{VSGTU_2003_19_19_a4,
     author = {E. N. Ogorodnikov},
     title = {Some characteristic problems for loaded systems of differential equations and their relationship with non-local boundary value problems},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {22--28},
     year = {2003},
     volume = {19},
     number = {19},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2003_19_19_a4/}
}