Willi Frei
- Hybridations durables. In: Tracés, v. 140 (Juli 2014). (2014):
- Architecture durable en pratique. In: TEC21, v. 137 (November 2011). (2011):
- Nachhaltige Architektur in der Praxis. In: TEC21, v. 137 (November 2011). (2011):
- An Innovative Architectural Strategy for the Integration of Energy Issues into the Design Process of a Commercial Center in Switzerland. In: Journal of Building Construction and Planning Research, v. 2, n. 2 ( 2014). (2014):