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  Author Title Year Publication (up) Serial Volume Pages Links
Heinrich, B.; Bugnyar, T. Just how smart are ravens? 2007 Scientific American 4101 296 64-71 details   openurl
Neuringer, A. Reinforced variability in animals and people: implications for adaptive action 2004 The American Psychologist 4106 59 891-906 details   doi
Quesada, J; Kintsch, W.; Gomez, E. Complex problem-solving: a field in search of a definition? 2005 Theoretical Issues in Ergonomics Science 604 6 5-33 details   doi
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