1. and , in: Structure and Bonding in Non-Crystalline Solids, Ed. and , Plenum Press, New York-London (p. 45).
2. , and , Abstr. VIII. Internat. Symp. Boron, Borides, Carbides, Nitrides, and Related Compounds, Tbilisi, October 8 to 12, 1984 (p. 12).
3. Status of YB66-type structures