A mathematical theory of origami constructions and numbers. Alperin, Roger C. — 2000 The New York Journal of Mathematics [electronic only]
A splitting theorem for linear polycyclic groups. Abels, Herbert; Alperin, Roger C. — 2009 The New York Journal of Mathematics [electronic only]
Linear Groups of Finite Cohomological Dimension. Peter B. Shalen; Roger C. Alperin — 1982 Inventiones mathematicae