TY - JOUR A1 - Tanskanen, A.O. A1 - Jokela, M. A1 - Danielsbacka, M. A1 - Rotkirch, A. T1 - Grandparental effects on fertility vary by lineage in the United Kingdom Y1 - 2014 DO - 10.1007/s12110-014-9200-9 JF - Human Nature VL - 25 IS - 2 ER -