Köhler illumination (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Köhler illumination" in English language version.

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archive.org

Köhler, August (1893). "Ein neues Beleuchtungsverfahren für mikrophotographische Zwecke". Zeitschrift für wissenschaftliche Mikroskopie und für Mikroskopische Technik. 10 (4): 433–440.

books.google.com

Koehler, August (1894). "New Method of Illumination for Photomicrographical Purposes". Journal of the Royal Microscopical Society. 14: 261–262.
Chaves, Julio (2015). Introduction to Nonimaging Optics, Second Edition. CRC Press. ISBN 978-1482206739.