Study of Bc -→X(3872)π-(K-) decays in the covariant light-front approach Wei Wang, Yue-Long Shen and Cai-Dian Lü Eur. Phys. J. C, 51 4 (2007) 841-847 Published online: 01 August 2007 DOI: 10.1140/epjc/s10052-007-0334-3