Hayitova Mohidil Alijon qizi. “CHIZIQLI CHEGARALANGAN OPERATORLAR. O’Z-O’ZIGA QO’SHMA OPERATORLAR VA UNING SPEKTRI. MUSBAT VA UNITAR OPERATORLAR”. Journal of New Century Innovations, vol. 27, no. 5, Apr. 2023, pp. 128-40, https://newjournal.org/new/article/view/5734.