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2. Gramlich, E. M.,A Guide to Benefit-Cost Analaysis, second edition, Prentice Hall, 1990.
3. Försäkringsförbundet, Brandstatistik, FSAB, 1990?92.
4. Hansen, A. T. and Platts, R.E.,The Costs and Benefits of Smoke Alarms in Canadian Houses Canada Mortgage and Housing Corporation, Ottawa, 1990.
5. Directorate for Fire and Explosion Prevention, unpublished data, Direktoratet for Brann-og Eksplosjonsvern, Brannstatistikk 1990?1992, Länsförsäkringar, Värmland, unpublished data.