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Simmons, G. F., & Robertson, J. S. (2003). Differential equations with applications and historical notes (2nd ed.). New Delhi: Tata McGraw-Hill Publishing Company Limited.

Simmons, George F., and John S. Robertson. Differential Equations With Applications and Historical Notes. 2nd ed. New Delhi: Tata McGraw-Hill Publishing Company Limited, 2003.

Simmons, George F., and John S. Robertson. Differential Equations With Applications and Historical Notes. 2nd ed. New Delhi: Tata McGraw-Hill Publishing Company Limited, 2003.