Cullen, G. E., Harrison, T. R., Calhoun, J. A., Wilkins, W. E., & Tims, M. M. (1931). STUDIES IN CONGESTIVE HEART FAILURE: XIII. The Relation of Dyspnea of Exertion to the Oxygen Saturation and Acid-Base Condition of the Blood.

Cullen, Glenn E., T. R. Harrison, J. A. Calhoun, W. E. Wilkins, och M. M. Tims. STUDIES IN CONGESTIVE HEART FAILURE: XIII. The Relation of Dyspnea of Exertion to the Oxygen Saturation and Acid-Base Condition of the Blood. 1931.

Cullen, Glenn E., et al. STUDIES IN CONGESTIVE HEART FAILURE: XIII. The Relation of Dyspnea of Exertion to the Oxygen Saturation and Acid-Base Condition of the Blood. 1931.