Talk at the Workshop Continuous Advances in QCD, p.9405246 ,
Quark?hadron duality, hep-ph/0009131 ,
Invited talk at Les Rencontres de Physique de la Vallée d'Aoste, Phys. Rev. D, vol.43, issue.819, 1990. ,
Heavy flavor decays, OPE, and duality in the two-dimensional ???t Hooft model, Physical Review D, vol.59, issue.5, p.54011, 1999. ,
DOI : 10.1103/PhysRevD.59.054011