1. The energy output of coal miners during work;Moss;Trans Inst Min Eng,1934
2. The energy expended while walking in stooping postures;Bedford;Br J Ind Med,1955
3. The energy expenditure of coal-miners at work;Humphreys;Br J Ind Med,1962
4. Ayoub MM, Bethea NJ, Bobo M, Burford CL, Caddel K, Intaranont K, et al. Mining in low coal, vol. 1: biomechanics and work physiology. Final Report—U.S. Bureau of Mines Contract No. HO3087022. Lubbock, Texas: Texas Tech University; 1981.
5. Metabolic costs of stoopwalking and crawling;Morrissey;Appl Ergon,1985