TY - BOOK AU - Pennings, F TI - Between soft and hard law : the impact of international social security standards on national social security law SN - 9789041124913 U1 - 3402 PEN PY - 2006/// CY - The Hague ; Boston PB - Kluwer Law International ; Sold and distributed in North, Central and Soth America by Aspen KW - Economics ER -