dawood Mohsen, Dr.salim, و Eman sadiq jaafer. 2020. "On (K-N)*-Quasinormal Operator". مجلة المستنصرية للعلوم والتربية 18 (5):1-12. https://edumag.uomustansiriyah.edu.iq/index.php/mjse/article/view/313.