Materials in space -- science, technology and exploration : symposium held November 29-December 2, 1998, Boston, Massachusetts, U.S.A.. pp.281-284, 1999. Warrendale, Pa.. Materials Research Society
Rare earths '98 : proceedings of the International Conference on Rare Earths, held in Fremantle, Western Australia, October 25-30, 1998. pp.348-353, 1999. Zuerich, Switzerland. Trans Tech Publications