The formation of fragments in symmetric heavy ion collisions

Abstract : The attempt to bring to light an urban press is indissociable of taking city (or "l'urbain") into account as global concept. From such context, it's a matter of question how far it's possible to perceive "urban" press discourses through some main discourse types, spotted at a global level. The instituting discourse approach privileged here is tested from french, brazilian and american papers examples, in different times.