P. I. Silva de Medeiros, N. Carvalho Roos, R. Gondim D'Oliveira, A. Rosa Carvalho, and J. A. da Costa Penha, “LEARNING ECOLOGICAL CONCEPTS BEFORE-AFTER TRACKING IN ENVIRONMENTAL TRAIL”, TI, vol. 9, no. 1, pp. 31–42, Sep. 2019, doi: 10.5216/teri.v9i1.51982.