Pannawit Khamrot และ Manoj Siripitukdet. (2019) On properties of generalized bipolar fuzzy semigroups. <i>Songklanakarin Journal of Science and Technology</i>, <i>41</i>(2), 405-413.Pannawit Khamrot และ Manoj Siripitukdet. "On properties of generalized bipolar fuzzy semigroups". Songklanakarin Journal of Science and Technology 41 (2019):405-413.Pannawit Khamrot และ Manoj Siripitukdet. On properties of generalized bipolar fuzzy semigroups. Research and Development Office, Prince of Songkla University:ม.ป.ท. 2019.