1. Norway's Official Statistics, Statistical Yearbooks of Norway 1863–1966. Statistik Sentralbyrå, Oslo.
2. Strøm, A. De akutte smittsomme sykdommene og boligene. Nord. Med. 2 (1939) 1499–415.
3. Taylor, I. andKnowelden, J. Principles of Epidemiology, p. 236. J. & A. Churchill, London 1957.
4. Radl, E. Das derzeitige Verhalten des Scharlachs. Wien. med. Wschr. 120 (1970) 745–750.