Marcel Tolkowsky (French Wikipedia)

Analysis of information sources in references of the Wikipedia article "Marcel Tolkowsky" in French language version.

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folds.net

(en) Marcel Tolkowsky, Diamond Design : A Study of the Reflection and Refraction of Light in a Diamond, E. & F. N. Spon (Londres), Spon & Chamberlain (New York), 1919 (lire en ligne)

nytimes.com

query.nytimes.com

(en) « Marcel Tolkowsky, 92, A Retired Gemologist », The New York Times,‎ 15 février 1991 (lire en ligne)