1. Becker, K., 1952: Untersuchungen zur Bestimmung der Gebrauchsdosis von Rattengiften; Schädlingsbek.,44, p. 98.
2. Bentley, E. W., 1969: The warfarin resistance problem in England and Wales; Schriftr. Ver. Wasser-, Boden- Lufthyg.,32, p. 19.
3. Boyle, C. M., 1960: Case of apparant resistance of Rattus norvegicus Berkenhout to anticoagulant poisons; Nature, Lond.,188, p. 157.
4. Drummond, D. C., 1966: Rats resistant to warfarin; New Scient.,30,. p. 771.
5. Drummond, D. C., 1968: Tentative instructions for determining the susceptability or resistance of rodents to anticoagulant rodenticides; World Health Organization, INSI/WP/68.12 a.