Changes in breath 13CO2/12CO2 consequent to exercise and hypoxia

T. J. Barstow, D. M. Cooper, S. Epstein, K. Wasserman
1989 Journal of applied physiology  
doi:10.1152/jappl.1989.66.2.936 pmid:2496079 fatcat:ignv7pxxpvexnm2lq2fbriteiy