Derrick, W. R., Grossman, S. I., & Grossman, S. I. (1997). Elementary differential equations with boundary value problems (4th ed.). Reading, Mass.: Addison-Wesley.
Παραπομπή Chicago StyleDerrick, William R., Stanley I. Grossman, and Stanley I. Grossman. Elementary Differential Equations With Boundary Value Problems. 4th ed. Reading, Mass.: Addison-Wesley, 1997.
Παραπομπή MLADerrick, William R., Stanley I. Grossman, and Stanley I. Grossman. Elementary Differential Equations With Boundary Value Problems. 4th ed. Reading, Mass.: Addison-Wesley, 1997.
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