Powers, D. L. (1985). Elementary differential equations with boundary value problems. Prindle, Weber & Schmidt.
Lua i Stíl Chicago (17ú heag.)Powers, David L. Elementary Differential Equations with Boundary Value Problems. Boston: Prindle, Weber & Schmidt, 1985.
Lua MLA (9ú heag.)Powers, David L. Elementary Differential Equations with Boundary Value Problems. Prindle, Weber & Schmidt, 1985.
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