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3. Allahverdiev, Dž. E., On the completeness of the system of eigenelements and adjoint elements of a class of nonselfad joint operators depending on a parameter λ, Dokl. Akad. Nauk SSSR 160 (1965), 1231–1234 (Russian), Engl. transl.: Soviet Math. Dokl. 6(1965), 271–275
4. Multiply complete systems and nonselfadjoint operators depending on a parameter λ;Allahverdiev;Dokl. Akad. Nauk SSSR,1966
5. Über Entwicklungsfragen bei Operatorenbüscheln;Bauer,1979