Platonic Triangles of Groups. - Roger C. Alperin (Exp. Math., 1998)

Nonvanishing of Algebraic Entropy for Geometrically Finite Groups of Isometries of Hadamard Manifolds. - Roger C. Alperin; Gennady A. Noskov (Int. J. Algebra Comput., 2005)

Trisections and Totally Real Origami. - Roger C. Alperin (Am. Math. Mon., 2005)

The Modular Tree of Pythagoras. - Roger C. Alperin (Am. Math. Mon., 2005)

Integral Sets and Cayley Graphs of Finite Groups. - Roger C. Alperin; Brian L. Peterson (Electron. J. Comb., 2012)