Multicomponent inclusions in Nacken synthetic emeralds. Published in Journal of Gemmology, 1999.
Author(s): K. Schmetzer, L. Kiefert, H.-J. Bernhardt
The colour of Igmerald: I.G. Farbenindustrie flux-grown synthetic emerald. Published in Journal of Gemmology, 1998.
Author(s): K. Schmetzer, L. Kiefert
Hydrothermal synthetic emeralds from Australia: emeralds and pink beryls. Published in 1993.
Author(s): H.A. Haenni