@article{JOLT_1993_3_2_a4,
     author = {V. L. Ostrovskyi and Y. S. Samoilenko},
     title = { On {Pairs} of {Self-Adjoint} {Operators}},
     journal = {Journal of Lie Theory},
     pages = {185--218},
     year = {1993},
     volume = {3},
     number = {2},
     zbl = {0802.47017},
     url = {http://geodesic.mathdoc.fr/item/JOLT_1993_3_2_a4/}
}