Brenker, F. E., Vollmer, C., Vincze, L., Vekemans, B., Szymanski, A., Janssens, K., Szaloki, I., Nasdala, L., Joswig, W., & Kaminsky, F. (2007). Carbonates from the lower part of transition zone or even the lower mantle. Earth and Planetary Science Letters, 260(1-2), 1-9.