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2. Safebehavior reinforcement;Bird;American Society of Safety Engineers Journal,1970
3. Field research methods: Interviewing, questionnaires, participant observation, systematic observation, unobtrusive measures;Bouchard,1976
4. Time series analysis: Forecasting and control;Box,1976
5. The control of industrial accidents: Economic theory and empirical evidence;Chelius;Law and Contemporary Problems,1974