TY - JOUR A1 - Tesch-Römer, Clemens A1 - von Kondratowitz, Hans-Joachim T1 - Comparative ageing research: a flourishing field in need of theoretical cultivation Y1 - 2006 DO - 10.1007/s10433-006-0034-0 JF - European Journal of Ageing VL - 3 IS - 3 SP - 155 EP - -167 ER -