Anastigmat (English Wikipedia)

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

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archive.org

Clerc, L. P. (1937). "X: Choice of a Lens: Testing: Care of Lenses". Photography: Theory and Practice (Second ed.). Sir Isaac Pitman & Sons, Ltd. pp. 61–76.
Kingslake, Rudolf (1989). "6: The First Anastigmats". A History of the Photographic Lens. San Diego, California: Academic Press. pp. 81–102. ISBN 0-12-408640-3.
Kingslake, Rudolf (1989). "7: The Triplet Lens and Its Modifications". A History of the Photographic Lens. San Diego, California: Academic Press. pp. 103–115. ISBN 0-12-408640-3.

espacenet.com

worldwide.espacenet.com

US 560460, Aldis, Hugh Lancelot, "Photographic lens", published May 19, 1896