CZ:Ref:DOI:10.1016/j.biosystems.2006.09.030

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Ribeiro, S.; A. Loula & I. De Araujo et al. (2007), "Symbols are not uniquely human", Biosystems 90 (1): 263–272, DOI:10.1016/j.biosystems.2006.09.030 [e]