References
- Brouha , L. A. 1959 . “ Effect of work on the heart ” . In Work and the heart , Edited by: Rosenbaum , F. F. and Belknap , E. L. New York : P. B. Hoeber .
- Hagerman , F. C. 1969 . Unpublished report, research conducted with 1968 U.S. Olympic oarsmen. U.S. Olympic Rowing Committee