et. al., Asst.Prof.Dr.Lieth A. Majed,. “Types of Filter and Ultra-Filter With Applications”. Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 11 (May 10, 2021): 4373–4377. Accessed May 8, 2024. https://turcomat.org/index.php/turkbilmat/article/view/6569.