Observation of doubly-charmed B decays at LEP - Barate,R; Buskulic,D; Decamp,D; Ghez,P; Goy,C; Lees,JP; Lucotte,A; Merle,E; Minard,MN; Nief,JY; Pietrzyk,B; Alemany,R; et al. (EUROPEAN PHYSICAL JOURNAL C, 1998)