PULFREY, CarolineSOMMET, NicolasBUTERA, FabrizioGEX, SarahHEFTI, MathieuSALAZAR, Elizabeth2011-06-052011-06-052011-06-052009https://infoscience.epfl.ch/handle/20.500.14299/68145Psychologie et sociologiePsychologie socialeSections AR, SSIE, EDCHEngagement caritatifstudent work::master thesis