Conditions on periodicity for sum-free sets. Calkin, Neil J.; Finch, Steven R. — 1996 Experimental Mathematics
Difference density and aperiodic sum-free sets. Calkin, Neil J.; Finch, Steven R.; Flowers, Timothy B. — 2005 Integers
Trivial Selmer groups and even partitions of a graph. Brown, Morgan V.; Calkin, Neil J.; James, Kevin; King, Adam J.; Lockard, Shannon; Rhoades, Robert C. — 2006 Integers