The Substitution Rule
Source (Author)	Link
Matthew Leingang (NYU)	Link
D. A. Kouba (UC Davis)	Link 1, 2, 3
Paul Dawkins (Lamar University)	Link 1, 2, 3
Doron Zeilberger (Rutgers University)	Link
Gregory L. Naber (Drexel University)	Link 1, 2
Daniel C. Sloughter (Furman University)	Link
Randell Simpson (Temple College)	Link