1. van Meel FAMM, van Maaren AC, van Weezel GJ. In: Benesovsky F, editor. Proceedings of the Sixth Plansee Seminar. Metallwerk Plansee, Reutte, 1966:172
2. Eck R. Planseeber. Pulvermet 1974;3:165
3. Kalns E. Climax Report L-303-09, 1976:1
4. Endoh M, Kimura K, Udagawa T, Tanabe S, Seto H. High-Temperature–High Pressure, 1990;22:129
5. Meilin Z, Xinyu L, Hanguang L, Jiongfang F. In: Kouzuka Z et al., editors. Proceedings of International Symposium on Processing of Rare Earth Metals, 1990:435