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On the Partial Difference Equations, of Mathematical Physics (Classic Reprint)

Elementary Differential Equations and Boundry Value Problems Pape

Partial Differential Equations of Mathematical Physics - PB 1966 2nd, corrected

Elementary Differential Equations and Boundary Value Problems by William E. ...

Elementary Differential Equations and Boundry Value Problems - Boyce

Variational Methods Boundary Value Problems Elliptic Equations - M.A. Lavrent'ev

Differential Equations with boundary-Value Problems