![Formula](/articles/epl/abs/2005/15/epl8839/epl8839_tex_eq1.png)
![Formula](/articles/epl/abs/2005/15/epl8839/epl8839_tex_eq2.png)
Europhys. Lett., 71 3 (2005) 394-399
Published online: 06 July 2005
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