@article{RM_1990_45_6_a18,
     author = {S. A. Stepin},
     title = {The vertical structure of atmospheric vibrations: double completeness of the eigenfunctions of the problem},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {166--167},
     publisher = {mathdoc},
     volume = {45},
     number = {6},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1990_45_6_a18/}
}