References
- Atkinson , F. V. 1972 . Multiparameter Eigenvalue Problems , Vol. 1 , New York : Academic Press . Matrices and compact operators.
- Gohberg , I. C. and Krein , M. G. 1969 . “ Introduction to the theory of linear non self-adjoint operators ” . In A.M.S. Translations of Maths Monographs Vol. 15 , Rhode Island Providence
- Källström , A. and Sleeman , B. D. 1975 . “ An abstract multi-parameter eigenvalue problem ” . Vol. 2 , Uppsala University Mathematics Report .
- Prugovečki , E. 1971 . Quantum Mechanics in Hilbert Space , New York : Academic Press .
- Roach , G. F. and Sleeman , B. D. 1977 . On the spectral theory of operator bundles . J. Applic.Anal. , 7 : 1 – 14 .