Geodesic
Spectra of certain classes of operators in Hilbert space
Matematičeskie zametki, Tome 9 (1971) no. 3, pp. 303-310.

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The structure of certain classes of operators of the form $AB$, where $A$ and $B$ are self-adjoint, is investigated, and the spectra of certain $J$-semiunitary operators are described. 
@article{MZM_1971_9_3_a8,
     author = {T. Ya. Azizov},
     title = {Spectra of certain classes of operators in {Hilbert} space},
     journal = {Matemati\v{c}eskie zametki},
     pages = {303--310},
     publisher = {mathdoc},
     volume = {9},
     number = {3},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a8/}
}
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T. Ya. Azizov. Spectra of certain classes of operators in Hilbert space. Matematičeskie zametki, Tome 9 (1971) no. 3, pp. 303-310. http://geodesic.mathdoc.fr/item/MZM_1971_9_3_a8/