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Evidence for Two Numerical Systems That Are Similar in Humans and Guppies
Agrillo C,
Piffer L,
Bisazza A,
Butterworth B
(2012)
Evidence for Two Numerical Systems That Are Similar in Humans and Guppies.
PLOS ONE 7(2): e31923.
https://doi.org/10.1371/journal.pone.0031923