@article{ZNSL_1979_89_a10,
     author = {D. P. Kouzov},
     title = {An energy principle of uniqueness for acoustic boundary value problems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {124--133},
     publisher = {mathdoc},
     volume = {89},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1979_89_a10/}
}