W. J. Silveira Junior, L. D. Santana, C. R. Souza, R. V. Yaguinuma, C. R. Gomes, and M. A. L. Fontes, “What is the role of volunteer work in protected areas? A case study in Brazil”, S&N, vol. 34, no. 1, Jun. 2022, doi: 10.14393/SN-v34-2022-64289.