TY - JOUR A1 - Hammel, E.A. T1 - Chayanov revisited: A model for the economics of complex kin units Y1 - 2005a DO - 10.1073/pnas.0501987102 JF - Proceedings of The National Academy of Sciences, USA VL - 102 IS - 19 SP - 7043 EP - -7046 ER -