1. Validité de l'application de l'analyse factorielle à l'étude causale d'une séquence comportementale;Balthazart;Ann. Soc. Roy. Zool. Belg,1972
2. Short-term effects of testosterone propionate on the behaviour of young intact male domestic ducks (Anas platryhynchos);Balthazart;Psychol. Belg,1974
3. On the daily distribution of displays and sexual behaviour in semi-wild mallards;Balthazart;IRCS Med. Sci,1975
4. A correlation analysis of the daily distribution of displays and sexual behaviours in semi-wild mallards;Balthazart;Psychol. Belg,1976
5. Daily variations of behavioural activities and of plasma testosterone levels in the domestic duck Anas platyrhynchos;Balthazart;J. Zool. (London),1976