Edwards, C. H., Penney, D. E., & Penney, D. E. (1993). Elementary differential equations with boundary value problems (3rd ed.). Englewood Cliffs, NJ.: Prentice Hall.
Παραπομπή Chicago StyleEdwards, Charles Henry, David E. Penney, and David E. Penney. Elementary Differential Equations With Boundary Value Problems. 3rd ed. Englewood Cliffs, NJ.: Prentice Hall, 1993.
Παραπομπή MLAEdwards, Charles Henry, David E. Penney, and David E. Penney. Elementary Differential Equations With Boundary Value Problems. 3rd ed. Englewood Cliffs, NJ.: Prentice Hall, 1993.
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