Liew P, Shanmugarajah B, Chew I, Choong T, Tan K. Ultrasound Assisted Extraction of Nano Calcium from Waste Eggshell: A Preliminary Study on Crystal Violet Dye Removal. Chemical Engineering Transactions [Internet]. 20Sep.2015 [cited 7Jul.2024];45:1711-6. Available from: https://www.cetjournal.it/index.php/cet/article/view/CET1545286