TRAN VINH, L.; LE PHUC , N.; NGUYEN VAN , H.; PHAM THI HAI, Y.; NGO THUY, P.; TRAN VAN , T.; DANG THANH, T.; LE THI HOAI, N.; NGUYEN ANH , D. Optimisation of leaching procedure to recover La3+ from spent FCC catalyst of Dung Quat refinery using HNO3 . Petrovietnam Journal, v. 8, p. 34 - 40, 31 Aug. 2017.