1. Article 38, original papers by the late John Hopkinson;Hopkinson,1901
2. Article 39, original papers by the late John Hopkinson;Hopkinson,1901
3. Proceedings of Physical Society of London, A74;Hopkinson,1904
4. X. A method of measuring the pressure produced in the detonation of high, explosives or by the impact of bullets
5. Proceedings of Physical Society of London, B62;Kolsky,1949