http://tematres.ebsi.umontreal.ca/crsh2015_2/http://tematres.ebsi.umontreal.ca/crsh2015_2/skos/515force obligatoire http://tematres.ebsi.umontreal.ca/crsh2015_2/skos/515 contrat BT http://tematres.ebsi.umontreal.ca/crsh2015_2/skos/515 effet relatif UF http://tematres.ebsi.umontreal.ca/crsh2015_2/skos/515 effet entre les parties UF http://tematres.ebsi.umontreal.ca/crsh2015_2/skos/515 contenu obligationnel UF