References
- Campbell M. Quart. J. Med. 1934; 27: 369
- Erikson H. Spirometric investigation of cardiopulmonary disease,. J. Oslo City Hospitals 1953; 3: 179
- McMichael J. Hyperpnæa in heart Failure. Clin. Sc 1939; 4: 10
- Nielsen H. E. Acta Med. Scandinav. 1937; 29: 277
- Nylin G. Acta Med. Scandinav. 1933, suppl. 52
- Nomenclature and criteria for diagnosis of the heart and blood vessels. Fifth Edition. New York Heart Association, Inc., New York 1953
- Peabody F. W., Sturgis C. C. Int. Med. 1922; 29: 277s