Introduction to Difference Equations (Dover Books on Mathematics) - GOOD

Finite Difference Equations (Dover Books on Mathematics)

Introduction to Bessel Functions (Dover Books on Mathematics) - Paperback - GOOD

Introduction to Difference Equations (Dover Books on Mathematics)

Introduction to Partial Differential Equations with Applications (Dover Books on

An Introduction to Ordinary Differential Equations (Dover Books on Mathe - GOOD

Introduction to Difference Equation..., Samuel Goldberg

Introduction to Nonlinear Differential and Integral Equations (Dover Books on Ma