This article has an erratum: [erratum]

Issue
EPL
Volume 92, Number 5, December 2010
Article Number 54005
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/92/54005
Published online 05 January 2011

© EPLA, 2010