por Edwards, C. H. (Charles Henry), 1937- [autor] | Penney, David E [autor] | Palmas Velasco, Óscar Alfredo [traductor].
por Edwards, C. H. (Charles Henry), 1937- [autor] | Penney, David E [autor] | Consuelo Hidalgo y Mondragón, María del [traductor] | Edwards, C. H. (Charles Henry), 1937-. Elementary differential equations with boundary value problems.
por Edwards, C. H. (Charles Henry), 1937- [autor] | Penney, David E [autor].