Meira, A.R. (1978) “ Medico-social study of factors related to aircraft accidents with light planes occurred during the period of 1971 to 1975, S. Paulo, Brazil: I - The month and hour of the occurrence and the principal contributing factor ”, Revista de Saúde Pública, 12(2), pp. 129–137. doi:10.1590/S0034-89101978000200004.