1. Abbey S, Lee N, Bouvier J (1974) Geol Surv Can Pap No 1, Part B, 2
2. Bock R (1972) A handbook of decomposition methods in analytical chemistry. Verlag Chemie, Weinheim
3. Cantillo A, Sinex S, Helz G (1984) Anal Chem 56:33
4. Delijska A, Zadgorska Z (1985) Fresenius Z Anal Chem 322:413
5. Feinberg S, Philipova N (1963) Analysis of non-ferrous ores. Metalurgia, Moscow