@article{DAN_1985_285_4_a24,
     author = {V. V. Tyutekin and Yu. I. Bobrovnitskii},
     title = {Energy relations for the acoustical waveguides},
     journal = {Doklady Akademii Nauk},
     pages = {878--882},
     publisher = {mathdoc},
     volume = {285},
     number = {4},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1985_285_4_a24/}
}