(en) Andrew Chuter, « Royal Navy Subs To Get Upgraded Spearfish Torpedo », Defense News, (lire en ligne)
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(en) John M. Bellerby et Christopher S. Blackman, « The Interaction between Otto Fuel II and Aqueous Hydroxylammonium Perchlorate (HAP), Part I: Initial Observations and Time-to-Event Measurements », Propellants, Explosives, Pyrotechnics, vol. 29, no 5, , p. 262–266 (DOI10.1002/prep.200400055, lire en ligne)
(en) John M. Bellerby et Christopher S. Blackman, « The Interaction between Otto Fuel II and Aqueous Hydroxylammonium Perchlorate (HAP), Part I: Initial Observations and Time-to-Event Measurements », Propellants, Explosives, Pyrotechnics, vol. 29, no 5, , p. 262–266 (DOI10.1002/prep.200400055, lire en ligne)