N. Gad, A. E.-M. M-R, and H. Kandil, “Effect of cobalt supplement on rosemary (rosmarinus officinals L) A- herb yield, essential oil content and its composition”, IJBAS, vol. 3, no. 4, pp. 527–531, Dec. 2014, doi: 10.14419/ijbas.v3i4.3712.