 On the attraction between two perfectly conducting plates by Hendrik Casimir

Proceedings of the Koninklijke Nederlandse Akademie van Wetenschappen 51, 793–795; communicated 29 May 1948. Original calculation of the ideal parallel-plate electromagnetic vacuum-energy interaction. The hosted scan includes the 1997 Academy reprint at pp. 61–63; 1997 is not the original publication date.

Institution-hosted original scan: www.mit.edu/~kardar/research/seminars/Casimir/Casimir1948.pdf

Academy original: dwc.knaw.nl/DL/publications/PU00018547.pdf