2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/47499(Contribution to Proceedings of the Seventh International Symposium On Heavy Flavor Physics, July 7-11, 1997, Santa Barbara.) Theoretical approaches to form factors of semileptonic decays are discussed in application to $B \ra D + l+\bar ν_l$ decay.10 pages, LatexHigh Energy Physics - Phenomenologytext