Unpacking the big idea of proportionality: Connecting ratio, rate, proportion and variation. Yeo, J. B. W. In 2019.
bibtex   
@incollection{yeo_unpacking_2019,
	title = {Unpacking the big idea of proportionality: {Connecting} ratio, rate, proportion and variation},
	author = {Yeo, Joseph B. W.},
	year = {2019},
}

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