1. Alekseeva, A. K., and L. P.Izakova: Abstracts of papers of the 2nd scientific Conference of Moscow Res. Inst. Virus Prep., p. 6 (1960).
2. Anderson, J.: Study of Fever. J. Churchill, London, p. 180 (1861).
3. Gispen, R., enJ. G. Kapsenberg: Verslagen en Mededelingen betreffende de Volksgezondheid No. 12, blz. 140?144 (1966).
4. Gispen, E., J. D. Verlinde, andP. Zwart: Arch. ges. Virusforsch.21, 2, 205?216 (1967).
5. Kulikova, K. S., G. E.Zalovkina, M. T.Romanova, and R. V.Dubrovskata: Abstracts of papers of the 2nd scientific Conference of Moscow Res. Inst. Virus Prep., p. 57 (1960).