Fernández-Rañada, Antonio2023-06-212023-06-211983-100167-278910.1016/0167-2789(83)90302-0https://hdl.handle.net/20.500.14352/64901© 1983 Published by Elsevier B.V.We present a model in which a hadron is represented as a bound state of several nonlinear Dirac fields which we identify with the quarks. These fields interact by a fourth order coupling term. We define a particle as any finite energy solitary wave solution of the field equations and we show that the model admits only two kinds of particles: a) three quark (or three antiquark) states and b) n(quark-antiquark) states, n = 1, 2, 3. The Dirac fields are never free and, as they cannot show up as particles because there are no one field solitary waves, they are absolutely confined.journal articlehttp://dx.doi.org/10.1016/0167-2789(83)90302-0http://www.sciencedirect.commetadata only access537ElectricidadElectrónica (Física)2202.03 Electricidad