[BM]

Paul W. Berg and James L. McGregor,

*Elementary Partial Differential Equations*, Holden-Day, San Francisco, CA, 1966.\(\require{cancel}\newcommand{\nicefrac}[2]{{{}^{#1}}\!/\!{{}_{#2}}}
\newcommand{\unitfrac}[3][\!\!]{#1 \,\, {{}^{#2}}\!/\!{{}_{#3}}}
\newcommand{\unit}[2][\!\!]{#1 \,\, #2}
\newcommand{\noalign}[1]{}
\newcommand{\qed}{\qquad \Box}
\newcommand{\lt}{<}
\newcommand{\gt}{>}
\newcommand{\amp}{&}
\)

[BM]

Paul W. Berg and James L. McGregor, *Elementary Partial Differential Equations*, Holden-Day, San Francisco, CA, 1966.

[BD]

William E. Boyce and Richard C. DiPrima, *Elementary Differential Equations and Boundary Value Problems*, 9th edition, John Wiley & Sons Inc., New York, NY, 2008.

[EP]

C.H. Edwards and D.E. Penney, *Differential Equations and Boundary Value Problems: Computing and Modeling*, 4th edition, Prentice Hall, 2008.

[F]

Stanley J. Farlow, *An Introduction to Differential Equations and Their Applications*, McGraw-Hill, Inc., Princeton, NJ, 1994. (Published also by Dover Publications, 2006.)

[I]

E.L. Ince, *Ordinary Differential Equations*, Dover Publications, Inc., New York, NY, 1956.

[T]

William F. Trench, *Elementary Differential Equations with Boundary Value Problems*, Books and Monographs, Book 9, 2013, http://digitalcommons.trinity.edu/mono/9.