Keosonthi, C., Ingsuraruk, P., Dangprapun, S., Sookgul, P., Narumol, P., Saichompoo, U., and Malumpong, C. “The boosting of anthocyanin accumulation in black rice cv. Riceberry by spraying MgSO4 at two different altitudes under field conditions”. International Journal of Agricultural Technology, vol. 18, no. 4, July 2022, pp. 1551-66, https://li04.tci-thaijo.org/index.php/IJAT/article/view/8551.