@article{articlef7fa8675,
title   = {Orthodontic treatment time in 2- and 4-premolar-extraction protocols},
author = {Janson, Guilherme dos Reis Pereira and Maria, Fábio Rogério Torres and Barros, Sérgio Estelita Cavalcante and Freitas, Marcos Roberto de and Henriques, José Fernando Castanha},
year = {2006},
doi = {10.1016/j.ajodo.2005.12.026},
journal   = {American Journal of Orthodontics and Dentofacial Orthopedics}
}