1. Landscape and well-being: a scoping study on the health-promoting impact of outdoor environments;Abraham;International Journal of Public Health,2010
2. Aernouts, K., Jespers, K., 2005. Energiekengetallen van de tertiaire sector in Vlaanderen 2003 – Bijlage bij de energiebalans Vlaanderen 2003: onafhankelijke methode (Energy numbers of the tertiary sector in Flanders 2003 – appendix to the energy balance Flanders 2003) (In Flemish). Retrieved 18 February 2010 from www.emis.vito.be/sites/default/files/pagina/energie_cijfers_rapport_alg_2003_energiekengetallen.pdf.
3. Temperature decreases in an urban canyon due to green walls and green roofs in diverse climates;Alexandri;Building and Environment,2008
4. ANB (Administration Nature and Forest), 2012. Groen in de stad – Groendaken – Subsidies (Green in the city – Green roofs – Subsidies) (In Flemish). Retrieved 12 May 2012 from www.natuurenbos.be/nl-BE/Natuurbeleid/Groen/Groendaken/Subsidies_groendaken.aspx.
5. Arcadis, 2008. Groene daken Rotterdam – Maatschappelijke kosten-batenanalyse (Green roofs Rotterdam – Social cost benefit analysis). Final report. Arcadis (in Dutch).