General analysis of the rare Bc→Ds *ℓ+ℓ- decay beyond the standard model U.O. Yilmaz and G. Turan Eur. Phys. J. C, 51 1 (2007) 63-74 Published online: 01 June 2007 DOI: 10.1140/epjc/s10052-007-0306-7