This article has an erratum: [erratum]

Issue
EPL
Volume 96, Number 5, December 2011
Article Number 54004
Number of page(s) 5
Section Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics
DOI http://dx.doi.org/10.1209/0295-5075/96/54004
Published online 24 November 2011

© EPLA, 2011