@article{DE_2000_36_4_a14,
     author = {F. E. Lomovtsev},
     title = {The {Cauchy} problem for complete second-order hyperbolic differential equations with variable domains of operator coefficients},
     journal = {Differencialʹnye uravneni\^a},
     pages = {542--548},
     publisher = {mathdoc},
     volume = {36},
     number = {4},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_4_a14/}
}