Low momentum scattering of the Dirac particlewith an asymmetric cusp potential Yu Jiang, Shi-Hai Dong, A. Antillón and M. Lozada-Cassou Eur. Phys. J. C, 45 2 (2006) 525-528 Published online: 25 November 2005 DOI: 10.1140/epjc/s2005-02430-7