Wongwai, S., N. Thiangtong, V. Pimonlsith, and P. Pornpunpaibool. “NONESSENTIAL PQ-INJECTIVE MODULES”. IJRDO -JOURNAL OF MATHEMATICS 3, no. 1 (January 31, 2017): 01-07. Accessed December 22, 2024. http://webdisk.ijrdo.org/index.php/m/article/view/1557.