Published online: 27 July 2011
DOI: 10.1140/epjp/i2011-11070-4
Published online: 26 July 2011
DOI: 10.1140/epjp/i2011-11069-9
Review
Published online: 26 July 2011
DOI: 10.1140/epjp/i2011-11067-y
Published online: 25 July 2011
DOI: 10.1140/epjp/i2011-11066-0
Published online: 21 July 2011
DOI: 10.1140/epjp/i2011-11065-1
Editors-in-Chief
B. Fraboni and G. García López
B. Fraboni and G. García López
We would like to thank the referee for very good and well intended remarks which helped us to improve our manuscript.