2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44808The basic ideas and power counting rules of chiral perturbation theory are discussed. The formalism of velocity dependent fields for baryons, and for hadrons containing a heavy quark, is explained. (Invited Talk, 1993 QCD Rencontres de Moriond)(uses harvmac, 9 pages, 1 figure), UCSD/PTH 93-12High Energy Physics - Phenomenologytext