2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/97579We discuss the production of new matter particles that are predicted by many extensions of the Standard Model, at future high--energy pp, eP and $e^+e^-$ linear colliders. We focus on the case of exotic, excited and di--fermions. Talk given at "Beyond the Standard Model IV", Lake Tahoe, Ca., December 1994.8 pages, latex, 5 figures (not included), the full *.ps file including the figures can be obtained via anonymous ftp at ftp://lpsvsh.lps.umontreal.ca/hep_th/tahoe.psHigh Energy Physics - Phenomenologytext