Weak decays of heavy mesons in a covariant quark model D. Merten, R. Ricken, M. Koll, B. Metsch and H.R. Petry Eur. Phys. J. A, 13 4 (2002) 477-491 Published online: 15 April 2002 DOI: 10.1140/epja/iepja1357