[3] Arenas L, Ortega M, García-Martínez M J, et al. Journal of Geochemical Exploration, 2011, 108(1): 21.
[7] Martin S, Petr M, Emmanuelle P, et al. Spectrochimica Acta Part B: Atomic Spectroscopy, 2001, 56(4): 443.
[10] Kolibarska I, Velichkov S, Daskalova N. Spectrochimica Acta Part B: Atomic Spectroscopy, 2008, 63(5): 603.
[11] Supharart S, Weerawan W, Juwadee S, et al. Spectrochimica Acta Part B: Atomic Spectroscopy, 2011, 66(6): 476.