@article{VMUMM_1988_2_a0,
     author = {V. P. Serebryakov},
     title = {The number of solutions in the space $L_2$ of a nonselfadjoint system of second-order differential equations},
     journal = {Vestnik Moskovskogo universiteta. Matematika, mehanika},
     pages = {3--8},
     publisher = {mathdoc},
     number = {2},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VMUMM_1988_2_a0/}
}