@article{ZNSL_1969_15_a4,
     author = {A. S. Blagoveshchenskii},
     title = {One dimensional reverse boundary problem for the hyperbolic equation of second order},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {85--90},
     publisher = {mathdoc},
     volume = {15},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1969_15_a4/}
}