Estimating the Long-Run Metro Demand Elasticities for Lisbon: A Time-Varying Approach
Patricia C. Melo, Nuno Sobreira, Pedro Goulart
Transportation Research Part A: Policy And Practice, vol. 126, 2019, p. 360-376.

Child Labour and Educational Success in Portugal
Pedro Goulart, Arjun Bedi
Economics of Education Review, vol. 27, 2008, p. 575-587.