Faiku, F., A. Haziri, F. Gashi, and H. Faiku. “Extraction of Copper, Lead and Nickel from Hydrochloric Acid Solutions by N-Methyl-N,N,N-Trioctyloctan-1-Ammonium Chloride in Methyl Isobutyl Ketone”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 22, no. 1, May 2015, pp. 393-02, https://gssrr.org/index.php/JournalOfBasicAndApplied/article/view/3953.