Coupling constants of bottom (charmed) mesons with the pion from three-point QCD sum rules M. Janbazi, N. Ghahramany and E. Pourjafarabadi Eur. Phys. J. C, 74 2 (2014) 2718 Published online: 06 February 2014 DOI: 10.1140/epjc/s10052-014-2718-5