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2. F.W. Sears, M.W. Zemansky, H.D. Young, College Physics (5th edn), Addison-Wesley, Philippines, 1980.
3. F. Rodriguez, Principles of Polymer Systems (2nd edn), Ch. 8, McGraw-Hill, Singapore, 1983.
4. ASTM D4092-90, ASTM, Philadelphia.
5. B.K. Jones, Electronics for Experimentation and Research, Prentice-Hall, London, 1986.