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Continue to ChatOn the extended spectrum of some quasinormal operators - https://avesis.ktu.edu.tr/publication/details/10204c80-91c5-4d83-b052-a086e89ae165/on-the-extended-spectrum-of-some-quasinormal-operators
On the extended spectrum of some quasinormal operators - https://avesis.ktu.edu.tr/publication/details/10204c80-91c5-4d83-b052-a086e89ae165/on-the-extended-spectrum-of-some-quasinormal-operators