@article{MZM_2003_74_5_a0,
     author = {A. V. Borovskikh},
     title = {Sign {Regularity} {Conditions} for {Discontinuous} {Boundary-Value} {Problems}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {643--655},
     publisher = {mathdoc},
     volume = {74},
     number = {5},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2003_74_5_a0/}
}