MIME Security with Pretty Good Privacy (PGP). - Michael Elkins (RFC, 1996)

MIME Security with OpenPGP. - Michael Elkins; Dave Del Torto; Raph Levien; Thomas Roessler (RFC, 2001)

Capturing Domain Knowledge Through Extensible Components. - Erik Kline; Genevieve Bartlett; Geoff Lawler; Robert Story; Michael Elkins (TRIDENTCOM, 2018)