E. M. Vieira, J. A. C. Gonçalves, R. C. A. Monte-Mor, J. L. Maia, and G. de P. Queiroz, “Payment for Environmental Services - An Example of Sustainable Management”, ijaers, vol. 6, no. 3, Oct. 2019, Accessed: Jul. 22, 2024. [Online]. Available: https://journal-repository.com/index.php/ijaers/article/view/977