Gaebel, Markus, and Annika Feige. "Estimating the impact of sustainability criteria on Swiss residential real estate returns." In 19th Annual European Real Estate Society Conference. ERES: Conference. Edinburgh, Scotland, 2012.

Feige, Annika, Holger Wallbaum, Lukas Windlinger, and Marcel Janser. "Quality of sustainable office buildings: The impact of sustainable buildings on the comfort, well-being and productivity of building users." In 19th Annual European Real Estate Society Conference. ERES: Conference. Edinburgh, Scotland, 2012.