CZ:Ref:DOI:10.1038/438900a

Giles, J. (2005), "Internet encyclopaedias go head to head", Nature 438: 900–901, DOI:10.1038/438900a ^[e]

A widely cited and debated study which compared the accuracy of 42 entries each in the English Wikipedia and the Encyclopaedia Britannica, concluding that both had similar numbers of factual errors.