1. W. E. Dunn:Trans. TMS-AIME, 1960, vol. 218, pp. 6–12.
2. W. E. Dunn:Processes for Rutile Substitutes, Appendix D, page 89;PB212898, National Materials Advisory Board, June 1972, also:Processes for Rutile Substitutes, National Research Council of the National Academy of Sciences, National Academy of Engineering NMAV-293, June 1972.
3. W. E. Dunn:Met. Trans. B, 1979, vol. 10B, pp. 293–94.
4. Arne Bergholm:Tram. TMS-AIME, 1961, vol. 221, pp. 1121–29.
5. A. J. Morris and R. F. Jensen:Met. Trans. B, 1976, vol. 7B, pp. 89–93.