1. American Conference of Governmental Industrial Hygienists (2008) Threshold limit values and biological exposure indices. Cincinnati, Ohio
2. Astrand PO, Rodhal K (1986) Threshold limit values and biological exposure indices, Text book of work physiology. McGraw Hill, New York
3. Brake R, Bates GA (2002) Valid method for comparing rational and empirical heat stress indices. Ann Occup Hyg 46:165–174
4. Chamoux A, Borel AM, Catilina P (1985) Pour la standardization d’unifrequence cardiaque de repos. Arch Mal Prof 46:241–250
5. Chatterjee A, Banerjee N, Chatterjee S, Santra T, Agrawal KM, Mukherjee S (2015a) Assessment of physiological strain in male paddy cultivators due to work and exposure to fluctuation in thermal conditions in working environments. Survey 55:91–98. ISSN: 0586-0008