Longitudinal study of the sleep/wakw cycle of identical twins along the first six months of life - Lopes, Braz M.; Lopes, J. R.; Wey, D.; Miguel, M.; Carvalho, M. R.; Affini, L.; Duarte, L.; Miguel, M.; Torres, F.; Fracalossi, A. A.; Isola, A.; Menna-Barreto, Luiz Silveira (Latin-American Symposium on Chronobiology, 2003)