Nathiang, Pairote. 2020. “[Retracted Article] : Development of Rice Seed Dropping Machine for Paddy Field With Local Farmer Participation in Uttaradit Province [Area Based Development Research Journal, (2019), 11(3), 218-233] (in Thai)”. Area Based Development Research Journal 12 (2):158. https://so01.tci-thaijo.org/index.php/abcjournal/article/view/241200.