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Books about Kerei:
Hedvat ha-hayim mul hemdat ha-mavet: Sipur ha-mishpahah ke-rei la-'ani' ha-ishi (Hebrew Edition) by Bilhah Rubinshtain (1999)
Wiki information Kerei:
Kerei is a Kazakh tribe that originated in the Altay region and fled into modern-day Kazakhstan in the early 13th century after being defeated by Genghis Khan.