TY - JOUR A1 - Hesketh, T. A1 - Zhu, W. T1 - Abnormal sex ratios in human populations: Causes and consequences Y1 - 2006 DO - 10.1073/pnas.0602203103 JF - Proceedings of the National Academy of Sciences VL - 103 IS - 36 SP - 13271 EP - -13275 ER -