P. V. Long, G. Giuliani, A. E. Fallick, A. J. Boyce and V. Pardieu, Trace elements and oxygen isotopes of gem spinels in marble from the Luc Yen - An Phu areas, Yen Bai province, North Vietnam, Vietnam J. Earth Sci. 40 (2018) 165–177. DOI: https://doi.org/10.15625/0866-7187/40/2/12241.