1. V.M. Adamyan, D.Z. Arov: On the unitary couplings of semiunitary operators (Russian), Mat. Issled., Kishinev I(2) (1966), 3–64.
2. D.Z. Arov: On the Darlington method in the theory of dissipative systems (Russian), Dokl. Akad. Nauk SSSR, Vol. 201, No.3 (1971), 559–562.
3. D.Z. Arov: Darlington realization of matrix-valued functions (Russian), Izv. Akad. Nauk SSSR, Ser. Mat. 37, No. 6 (1973), 1299-1331
4. English translation: Math. USSR, Izvestija 7 (1973), 1295-1326.
5. D.Z. Arov: On unitary coupling with losses (Russian), Funkts. Anal. i ego Prilozhen. 8(4) (1974), 5–22.