Adams, J. Bull's eye, c1992:
Information trouvée : CIP t.p. (Gerald Bull) pub. info. (Dr.; aerophysicist; gun dealer; assassinated in
Brussels, Mar. 22, 1990)
His Paris Kanonen--the Paris Guns (Wilhelmgeschütze) and Project Harp, c1988:
Information trouvée : t.p. (G.V. Bull) Deut. bibl. (Bull, Gerald V.)
LAC internal file, April 9, 2019
Information trouvée : (heading: Bull, G. V. (Gerald V.); variants: Bull, Gerald; Bull, Gerald Vincent)
Lowther, W. Arms and the man, c1991:
Information trouvée : p. 17, etc. (George Vincent Bull; Gerry Bull; Jerry Bull; b. Mar. 9, 1928; d. Mar.
22, 1990)
Supercanon ! : le marchand d'armes qui visait les étoiles / Philippe Girard, 2023
Wikipedia, viewed on April 9, 2019
Information trouvée : (Gerald Bull; Gerald Vincent Bull; Canadian engineer who developed long-range artillery;
designed the Project Babylon "supergun" for the Iraqi government; assassinated in
Belgium in March 1990)