L -indistinguishability and R -groups for quasisplit groups : unitary groups in even dimension David C. Keys — 1987 Annales scientifiques de l'École Normale Supérieure
Supercuspidal representations of G S p 4 over a local field of residual characteristic 2, part I Charles Asmuth; C. David Keys — 1991 Compositio Mathematica
Artin L -functions and normalization of intertwining operators C. David Keys; Freydoon Shahidi — 1988 Annales scientifiques de l'École Normale Supérieure