Stefano de Gironcoli
Condensed Matter Sector,
International School for Advanced Studies
via Beirut 2-4, I 34014 Trieste, Italy
email:    degironc@sissa.it

Richard Needs
Cavendish Laboratory,
University of Cambridge,
Madingley Road, Cambridge CB3 0HE, United Kingdom
email:    rn11@phy.cam.ac.uk

Kiyoyuki Terakura
JRCAT-NAIR,
1-1-4 Higashi, Tsukuba,
Ibaraki 305-8562, Japan
email:   terakura@jrcat.or.jp