Volume 38, Number 2, March-April 2007
|Page(s)||28 - 30|
|Published online||17 April 2007|
Laboratoire Pierre Aigrain, Ecole Normale Supérieure, 24, rue Lhomond, 75231 Paris Cedex 05, France
2 Laboratoire de Physique des Solides, Université Paris-Sud, CNRS, UMR 8502, 91405 Orsay Cedex, France
This article has no abstract.
© European Physical Society, EDP Sciences, 2007
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