@article{PFMT_2013_1_a11,
     author = {F. E. Lomovtsev and D. A. Lyakhov},
     title = {Weak solutions of hyperbolic even-order operator-differential equations with variable domains},
     journal = {Problemy fiziki, matematiki i tehniki},
     pages = {67--73},
     publisher = {mathdoc},
     number = {1},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/PFMT_2013_1_a11/}
}