1. Life-Cycle Costing: A Guide for Selecting Energy Conservation Projects for Public Buildings, NBS BSS 113;Ruegg,1978
2. Optimal energy retrofits on existing multi-family buildings;Gustafsson,1986
3. The OPERA Model: optimal energy retrofits in multi-family residences;Gustafsson,1988
4. Economic evaluation of building design, construction, operation and maintenance :