@inproceedings{inproceedings27ad4622,
title   = {Observation of yawns: an alternative approach to the study of daytime sleepiness fluctuations in adolescents},
author = {Andrade, M M M and Benedito-Silva, Ana Amélia and Menna Barreto, Luiz Silveira},
year = {1993},
booktitle   = {Conference of the International Society for Chronobiology}
}