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. Engineering, Technology & Applied Science Research, Greece, v. 9, n. 1, p. 3859–3862, 2019. DOI: 10.48084/etasr.2538. Disponível em: https://etasr.com/index.php/ETASR/article/view/2538. Acesso em: 28 sep. 2021.