Hayitova Mohidil Alijon qizi. 2023. “CHIZIQLI CHEGARALANGAN OPERATORLAR. O’Z-O’ZIGA QO’SHMA OPERATORLAR VA UNING SPEKTRI. MUSBAT VA UNITAR OPERATORLAR”. Journal of New Century Innovations 27 (5):128-40. https://newjournal.org/new/article/view/5734.