Children's Relational Knowledge of Addition and Subtraction. Baroody, A. J. Cognition and Instruction, 17(2):137–175, June, 1999.
Children's Relational Knowledge of Addition and Subtraction [link]Paper  doi  bibtex   
@article{baroody_childrens_1999,
	title = {Children's {Relational} {Knowledge} of {Addition} and {Subtraction}},
	volume = {17},
	issn = {0737-0008, 1532-690X},
	url = {http://www.tandfonline.com/doi/abs/10.1207/S1532690XCI170201},
	doi = {10.1207/S1532690XCI170201},
	language = {en},
	number = {2},
	urldate = {2024-04-27},
	journal = {Cognition and Instruction},
	author = {Baroody, Arthur J.},
	month = jun,
	year = {1999},
	pages = {137--175},
}

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