(PDF) PhysicsWeb article on the Casimir Effect The Casimir Force C. J. Gorter, C. J. Gorter's life & science, University of Leiden, Leiden, The Netherlands.
(PDF) PhysicsWeb article on the Casimir Effect The Casimir Force (недоступная ссылка) C. J. Gorter, C. J. Gorter’s life & science, University of Leiden, Leiden, The Netherlands.