absence of strong associations in these areas suggests the need for a new hypothesis.".) See Stross, Tzeltal Marriage by Capture (Tzeltal culture); George
[2018-02-24]. (原始内容存档于2021-03-07). "The Causes of Slavery or Serfdom: A Hypothesis" (页面存档备份,存于互联网档案馆) (discussion and full online text) of Evsey Domar (1970)