@article{DE_2003_39_4_a9,
     author = {T. I. Kiguradze and T. Kusano},
     title = {Well-Posedness of {Initial-Boundary} {Value} {Problems} for {Higher-Order} {Linear} {Hyperbolic} {Equations} with {Two} {Independent} {Variables}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {516--526},
     publisher = {mathdoc},
     volume = {39},
     number = {4},
     year = {2003},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2003_39_4_a9/}
}