1. Belle Progress Report, Belle Collaboration, KEK–PROGRESS–REPORT–97–1, 1997.
2. Status of the BaBar Detector, BaBar Collaboration, SLAC–PUB–7951, presented at 29th International Conference on High Energy Physics (ICHEP–98), Vancouver, Canada, 1998.
3. P. Ball, V.M. Braun, H.G. Dosch, Phys. Lett. B 273 (1991) 316; B 259 (1991) 481.
4. Dependence of the form factors of B → πℓν on the heavy quark mass