http://medind.nic.in/iae/t09/i2/iaet09i2p83.pdfArchived 2016-06-16 at the Wayback Machine, Effect of Tripod Position on Objective Parameters of Respiratory Function in Stable Chronic Obstructive Pulmonary Disease; S.P. Bhatt1, R. Guleria1, T.K. Luqman-Arafath1, A.K. Gupta2, A. Mohan1, S. Nanda1 and J.C. Stoltzfus3
http://medind.nic.in/iae/t09/i2/iaet09i2p83.pdfArchived 2016-06-16 at the Wayback Machine, Effect of Tripod Position on Objective Parameters of Respiratory Function in Stable Chronic Obstructive Pulmonary Disease; S.P. Bhatt1, R. Guleria1, T.K. Luqman-Arafath1, A.K. Gupta2, A. Mohan1, S. Nanda1 and J.C. Stoltzfus3