Core systems of number. Feigenson, L., Dehaene, S., & Spelke, E. Trends in cognitive sciences, 8(7):307–314, 2004.
bibtex   
@article{feigenson_core_2004,
	title = {Core systems of number},
	volume = {8},
	number = {7},
	journal = {Trends in cognitive sciences},
	author = {Feigenson, Lisa and Dehaene, Stanislas and Spelke, Elizabeth},
	year = {2004},
	pages = {307--314}
}

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