Yahia, Z. A., E. S. K. Amal, M. G. Khalid, and M. A. Neveen,
"THE RELATION BETWEEN NYHA CLASSIFICATION AND CARDIOPULMONARY EXERCISE TEST IN EVALUATING DISABILITY IN WORKERS WITH CHF",
Published in Egyptian Journal of Occupational Medicine, vol. 24, issue 1, pp. 57 – 69, 2000.