[1]
P. Liew, B. Shanmugarajah, I. Chew, T. Choong, and K. Tan, “Ultrasound Assisted Extraction of Nano Calcium from Waste Eggshell: A Preliminary Study on Crystal Violet Dye Removal”, Chemical Engineering Transactions, vol. 45, pp. 1711-1716, Sep. 2015.