TY - JOUR A1 - Gennetian, L.A. T1 - One or two parents? Half or step siblings? The effect of family structure on young children's achievement Y1 - 2005 DO - 10.1007/s00148-004-0215-0 JF - Journal of Population Economics VL - 18 IS - 3 SP - 415 EP - -436 ER -