Peter Young - Physics 115-242 - Introduction to Mathematica [2013] [p49]
Wolfram Mathematica Tutorial Collection - Differential Equation Solving With DSolve [2008] [p118]
Harald Höller - Introductory Tutorial to Mathematica 8 [2012] [p37]
Introduction to Mathematica [p24]
David C. Johnston - Physics 304 Text Supplement - Basics of Mathematica [2013] [p22]
Jenny A. Baglivo - Introduction to Mathematica Commands [2004] [p45]
Mark S. Gockenbach - Mathematica Tutorial - To Accompany Partial Differential Equations - Analytical and Numerical Methods [2010] [p120]
Mathematica Basics [p48]
Megan Frary - Mathematica Tutorial [2008] [p47]
Youngjoo Chung - Tutorial on Symbolic Computing With Mathematica [2011] [p47]
Nancy Blachman - Mathematica Journal - Demystifying Rules [2002] [p18]