1. E. G. Nawy, Prestressed concrete. Pearson Education. 5th ed. New Jersey: Prentice Hall, (2011).
2. A. E. Naaman, Prestressed concrete analysis and design: Fundamentals (pp. 360–364). New York: McGraw- Hill, (1982).
3. O. Ozkul, A new methodology for the analysis of concrete beams prestressed with unbonded tendons (Vol. 69, No. 05) (2007).
4. P. W. Abeles, Concrete Publication Ltd, 2, 555, (1965).
5. Tendon Stress in Continuous Unbonded Prestressed Concrete Members Part 2: Parametric Study