@article{DAN_1979_247_5_a3,
     author = {M. G. Krein and A. A. Nudelman},
     title = {On direct and inverse problems for the boundary dissipation frequencies of a nonuniform string},
     journal = {Doklady Akademii Nauk},
     pages = {1046--1049},
     publisher = {mathdoc},
     volume = {247},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1979_247_5_a3/}
}