The importance of number sense to mathematics achievement in first and third grades. Jordan, N. C, Glutting, J., & Ramineni, C. Learning and individual differences, 20(2):82–88, 2010.
bibtex   
@article{jordan_importance_2010,
	title = {The importance of number sense to mathematics achievement in first and third grades},
	volume = {20},
	number = {2},
	journal = {Learning and individual differences},
	author = {Jordan, Nancy C and Glutting, Joseph and Ramineni, Chaitanya},
	year = {2010},
	pages = {82--88}
}
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