Phansi, Piyawan, Jirayu Chumkate, and Duangjai Nacapricha. 2021. “Determination of Total Phosphorus Content in Chemical Fertilizer Samples Using Flow Injection Analysis System”. Science and Engineering Connect 44 (2). Bangkok, Thailand:225-36. https://ph04.tci-thaijo.org/index.php/SEC/article/view/10372.