Iqbal, R.; Zubair, M.; Pirzada, F.; Abro, F. N.; Ali, M.; Valasai, A. An Experimental Study on the Performance of Calcium Carbonate Extracted from Eggshells As Weighting Agent in Drilling Fluid. Eng. Technol. Appl. Sci. Res. 2019, 9, 3859-3862.