H. Almen

The crystal chemistry of Mn3+ in the clino- and orthozoisite structure types, Ca2M33+[OH|O|SiO4|Si2O7]: A structural and spectroscopic study of some natural piemontites and “thulites” and their synthetic equivalents

R. Arni, E. Tillmanns, K. Langer, 2002 .

Incorporation of chromium into aluminium borate 9Al2O3⋅ 2B2O3 (A9B2)

H. Schneider, E. Tillmanns, H. Almen, 1991 .