1. 1) WHO (1969) Health factors involved in working under conditions of heat stress, Technical Report Series No. 412, WHO, Geneva.
2. 2) ISO 7243 (1989a) Hot environments-estimation of heat stress on working man, based on the WBGT index (wet bulb globe temperature), ISO, Geneva.
3. 3) ISO 7933 (1989b) Hot environments-analytical determination and interpretation of thermal stress using calculation of required sweat rate, ISO, Geneva.
4. 4) ISO 7933 (2004) Ergonomics of the thermal environment-analytical determination and interpretation of heat stress using calculation of the predicted heat strain, ISO, Geneva.
5. 5) National Institute of Occupational Health and Safety (NIOSH) (1986) Occupational exposure to hot environments. Revised criteria, U.S. Department of Health, Education and Welfare, Washington D.C.