1. Achieser, N.I., Glasmann, I.M.: Theorie der linearen Operatoren im Hilbert-Raum. Verlag Harri Deutsch (1981)
2. Adamjan, V.M., Arov, D.Z.: On a class of scattering operators and characteristic operator-functions of contractions. Dokl. Akad. Nauk SSSR 160, 9–12 (1965)
3. Adamjan, V.M., Arov, D.Z.: On scattering operators and contraction semigroups in Hilbert space. Dokl. Akad. Nauk SSSR 165, 9–12 (1965)
4. Adamjan, V.M., Arov, D.Z.: Unitary couplings of semi-unitary operators. Mat. Issled. 1(2), 3–64 (1966)
5. Adamjan, V.M., Arov, D.Z.: Unitary couplings of semi-unitary operators. Akad. Nauk Armjan. 43(5), 257–263 (1966)