1. Pinilla, V., Ayuda, M.I., Sáez, L.A.: Rural depopulation and the migration turnaround in Mediterranean Western Europe: a case study of Aragon. J. Rural Community Dev. 3(1), 1–22 (2008)
2. Loures, L., Santos, R., Panagopoulos, T.: Urban parks and sustainable city planning-the case of Portimão, Portugal. WSEAS Trans. Environ. Dev. 3(10), 171–180 (2007)
3. Castanho, R.A.: Sustainable urban planning in transboundary areas: analysis of critical factors for territorial success. Doctoral thesis University of Extremadura (UEx) Badajoz, Spain, Department of Vegetal Biology, Ecology and Earth Sciences (2017)
4. Sander, R.A.: Urban vegetation impacts on the urban hydrology of Dayton Ohio. Urban Ecol. 9, 361–376 (1986)
5. Akbari, H., Pomerantz, M., Taha, H.: Cool surfaces and shade trees to reduce energy use and improve air quality in urban areas. Sol. Energy 70, 295–310 (2001)