[1] E. J. Albrecht: Funktionalkalküle in mehreren Veränderlichen. Dissertation zur Erlangung des Doktorgrades, Johannes Gutenberg-Universität zu Mainz, 1972.

[2] E. J. Albrecht: An example of a non-regular generalized scalar operator. Rev. Roum. Math. Pures et Appl. 18 (1973), 983-985. MR 0324471 | Zbl 0265.47012

[3] C. Apostol: Spectral decompositions and functional calculus. Rev. Roum. Math. Pures et Appl. 13 (1968), 1483-1530. MR 0250092 | Zbl 0176.43701

[4] E. Bishop: A duality theorem for an arbitrary operator. Рас. J. Math. 9 (1959), 379-397. MR 0117562 | Zbl 0086.31702

[5] I. Colojoară, C. Foiaş: Theory of generalized spectral operators. Gordon and Breach New York 1968. MR 0394282

[6] С. Foiaş: Spectral capacities and decomposable operators. Rev. Roum. Math. Pures et Appl. 13 (1968), 1539-1545. MR 0250093

[7] С. Foiaş: On the maximal spectral spaces of a decomposable operator. Rev. Roum. Math. Pures et Appl. 16 (1970), 1599-1606. MR 0278095

[8] Şt. Frunză: Une caractérisation des espaces maximaux spectraux des opérateurs $u$-scalaires. Rev. Roum. Math. Pures et Appl. 16 (1970), 1607-1609. MR 0278094

[9] Şt. Frunză: The Taylor spectrum and spectral decompositions. to appear in J. Functional Anal. MR 0394259

[10] J. L. Taylor: A joint spectrum for several commuting operators. J. Functional Anal. 6 (1970), 172-191. DOI 10.1016/0022-1236(70)90055-8 | MR 0268706 | Zbl 0233.47024

[11] J. L. Taylor: The analytic functional calculus for several commuting operators. Acta Math. 125 (1970), 1-38. DOI 10.1007/BF02392329 | MR 0271741 | Zbl 0233.47025

[12] F. H. Vasilescu: An application of Taylor's functional calculus. Rev. Roum. Math. Pures et Appl. 19 (1974), 1165-1167. MR 0358409 | Zbl 0292.47027