Joseph V. Smith
Amable J. Cruz
W. Nieuwenkamp
Mikhail Ostrooumov
R. J Kuryvial
Michael J Potter
United States. Bureau of Mines
Karl Chudoba
Arthur L. Day
NATO Advanced Study Institute on Feldspars Manchester, Eng. 1972.
David B. Slemmons
Paul H. Ribbe
Weixia Dong
D. S. Suryanarayana
Harold L. Alling
Stanley A. Feitler
C. Herbert
Unknown Author
Johannes Franciskus Osten