@book{14426,
	author = {Romanov, V. G.},
	title = {Integral geometry and inverse problems for hyperbolic equations},
	publisher = {Springer-Verlag},
	year = {1974},
	series = {Springer tracts in natural Philosophy},
	address = {Berlin},
	note = {"Title of the Russian original ed: Nekotorye obratnye zadachi dlja uravnenij giperbolihskgo tipa".}
}