@article{article10d4d6eb,
title   = {The ontogenesis of smiling and its association with mothers affective behaviors: a longitudinal study},
author = {Mendes, Deise Maria Leal Fernandes and Moura, Maria Lucia Pimental de Assis and Siqueira, José de Oliveira},
year = {2009},
doi = {10.1016/j.infbeh.2009.07.004},
journal   = {Infant Behavior and Development}
}