Lī, D. H., B. G. Kim, and S. R. Lee. “A Respiration-Metabolism Chamber System for Measuring Gas Emission and Nutrient Digestibility in Small Ruminant Animals”. Revista Colombiana De Ciencias Pecuarias, vol. 23, no. 4, Dec. 2010, pp. 444-50, doi:10.17533/udea.rccp.324608.