Notes, Comments and Preliminary results Sep 30 2023 Bruno M. Pegoraro , Thiago Costa Monteiro Caldeira and Silvio Rosa Paula   Truck drivers and drugs: impact of mandatory drug testing on safety on Brazilian highways   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result   Mar 07 2020 Caio Resende and Thiago Caldeira   Privatization of Brazilian airports: a synthetic control approach   Abstract  Contact Information  Citation  Full Text  -  Preliminary Result