EPL is available also on-line on www.epljournal.org
Issue EPL
Volume 98, Number 2, April 2012
Article Number 28004
Number of page(s) 6
Section Interdisciplinary Physics and Related Areas of Science and Technology
DOI http://dx.doi.org/10.1209/0295-5075/98/28004
Published online 30 April 2012

© EPLA, 2012