@article{MMO_1954_3_a3,
     author = {M. A. Naimark},
     title = {Investigation of the spectrum and the expansion in eigenfunctions of a nonselfadjoint operator of the second order on a semi-axis},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {181--270},
     publisher = {mathdoc},
     volume = {3},
     year = {1954},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1954_3_a3/}
}