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<xml><bibliography><APA>Poonchayar Patthanangkoor และ Sutasinee Wannusit. (2018) On Semipolygroups. &lt;i&gt;Thai Journal of Science and Technology&lt;/i&gt;, &lt;i&gt;7&lt;/i&gt;(5), 443-451.</APA><Chicago>Poonchayar Patthanangkoor และ Sutasinee Wannusit. "On Semipolygroups". Thai Journal of Science and Technology  7 (2018):443-451.</Chicago><MLA>Poonchayar Patthanangkoor และ Sutasinee Wannusit. On Semipolygroups. Thammasat University:ม.ป.ท. 2018.</MLA></bibliography></xml>
