Teklu Baissa, Amnat Suwanarit, Yongyuth Osotsapar, & Ed Sarobol. (2005). Status of B, Cu, Fe, Mo and Zn of Soils of Ethiopia for Maize Production: Greenhouse Assessment. Agriculture and Natural Resources, 39(3), 357–367. retrieved from https://li01.tci-thaijo.org/index.php/anres/article/view/243324