Coupling constants of bottom (charmed) mesons with the pion from three-point QCD sum rulesM. Janbazi, N. Ghahramany and E. PourjafarabadiEur. Phys. J. C, 74 2 (2014) 2718DOI: https://doi.org/10.1140/epjc/s10052-014-2718-5