N. A. Putri, H. M. Denny, M. Z. Rahfiludin, and D. Lestantyo, “Assessing the impact of heat stress exposure on heat strain: An analysis of outdoor and semi-outdoor roof tile workers using the Physiological Strain Index ”, Int J Occup Saf Health, vol. 16, no. 2, pp. 261–272, Jul. 2026, doi: 10.3126/ijosh.v16i2.89136.