Macchi Cassia, V., H. Bulf, K. McCrink, and M. D. de Hevia. “Operational Momentum During Ordering Operations for Size and Number in 4-Month-Old Infants”. Journal of Numerical Cognition, Vol. 3, no. 2, Dec. 2017, pp. 270-87, doi:10.5964/jnc.v3i2.67.