Waheed Ahmad Khan และผู้แต่งคนอื่นๆ. (2022) Bipolar picture fuzzy sets and relations with applications. <i>Songklanakarin Journal of Science an Technology (SJST)</i>, <i>44</i>(4), 987-999.Waheed Ahmad Khan และผู้แต่งคนอื่นๆ. "Bipolar picture fuzzy sets and relations with applications". Songklanakarin Journal of Science an Technology (SJST) 44 (2022):987-999.Waheed Ahmad Khan และผู้แต่งคนอื่นๆ. Bipolar picture fuzzy sets and relations with applications. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2022.