1. M.M. Benjamin(1978 ) Outline of Veterinary Clinical Pathology , 3rd Edn , Iowa State University Press, Ames, Iowa, p.108 .
2. G.R. Bolton(1975 ) Handbook of Canine Electrocardiography . Saunders, Philadelphia, p.126 .
3. The role of the left atrium in the development of pulmonary hypertension.
4. SUDDEN DEATH IN PUPPIES ASSOCIATED WITH A SUSPECTED VIRAL MYOCARDITIS