1. Harmaajärvi I. Sustainable Residential Area. Assessment of Environmental Impacts of Four Typical Finnish Residential Areas (in Finnish). Espoo, Finland: VTT research notes 1378, 1992.
2. Harmaajärvi I. The Ecological Balance of the New Residential Area at the Former Race Track in Sodankylä (in Finnish). Espoo, Finland: VTT Communities and Infrastructure, research report 454, 1998.
3. The ecological balance of “ecovillages” (in Finnish);Harmaajärvi,1999
4. Lahti P, Harmaajärvi I. Urban Form and Sustainable Development. International experiences (in Finnish). Helsinki, Finland: Ministry of the Environment, Physical Planning and Building Department, research report No. 1/1992, 1992.