TY - BOOK ED - Parlamento Europeo TI - The EU's mutual assistance clause: : First ever activation of Article 42(7) TEU PY - 2015/// PB - European Parliamentary Research Service KW - Cooperación transfronteriza - KW - Países de la Unión Europea KW - PCSD UR - http://www.europarl.europa.eu/RegData/etudes/BRIE/2015/572799/EPRS_BRI(2015)572799_EN.pdf ER -