1. H. Erhorn, Foreword to the Proceedings of IEA Future Building Forum Workshop, FIB, Stuttgart, April 1997
2. H. Kluttig, Energy performance of ed.build, in: T. Mróz, H. Erhorn (Eds.), State of the art overview, IEA ECBCS Annex 36 Working Document, 2002. http://www.annex36.com/cd_eca_fulldocumentation_delivery/uk/results/subtaskA.html.
3. L. Schoff, Decision makers motivations, in: T. Mróz, H. Erhorn (Eds.), State of the art overview, IEA ECBCS Annex 36 Working Document, 2002. http://www.annex36.com/cd_eca_fulldocumentation_delivery/uk/results/subtaskA.html.
4. http://www.annex36.com/eca/index.html – link to the English version of the ECA.
5. T. Mróz (Ed.), Overview of Retrofit Measures, IEA ECBCS Annex 36 Working Document, 2003. http://www.annex36.com/cd_eca_fulldocumentation_delivery/uk/results/subtaskA.html.