Ronnason Chinram และ Wichayaporn Jantanan; Natee Raikham. (2022) On Ordered Semigroups Containing Covered Bi-Ideals. <i>Science & Technology Asia</i>, <i>27</i>(4), 259-264.Ronnason Chinram และ Wichayaporn Jantanan; Natee Raikham. "On Ordered Semigroups Containing Covered Bi-Ideals". Science & Technology Asia 27 (2022):259-264.Ronnason Chinram และ Wichayaporn Jantanan; Natee Raikham. On Ordered Semigroups Containing Covered Bi-Ideals. Research Administration Division:ม.ป.ท. 2022.