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Arizona State University. Oldest flaked stone tools point to the repeated invention of stone tools. phys.org [online]. 2019-06-03 [cit. 2022-11-27]. Dostupné online. (anglicky)
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University of Birmingham. Chimpanzees can learn how to use tools without observing others. phys.org [online]. 2017-09-28 [cit. 2022-11-27]. Dostupné online. (anglicky)