Okewu, Emmanuel, Sanjay Misra, Luis Fernandez Sanz, Rytis Maskeliūnas, and Robertas Damaševičius. “An E-Environment System for Socio-Economic Sustainability and National Security”. Problemy Ekorozwoju 13, no. 1 (January 2, 2018): 121–132. Accessed July 3, 2024. https://ph.pollub.pl/index.php/preko/article/view/5044.