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WikiPedia: Johann_Heinrich_Lambert http://cantic.bnc.cat/registres/CUCId/a11446614 http://www.britannica.com/eb/article-9046942/Johan... http://www.nndb.com/people/654/000096366/ http://catalogo.bne.es/uhtbin/authoritybrowse.cgi?... http://docnum.unistra.fr:8080/cdm4/results.php?CIS... http://www.maths.tcd.ie/pub/HistMath/People/Lamber... http://uli.nli.org.il/F/?func=direct&doc_number=00... http://data.bibliotheken.nl/id/thes/p068418493 http://www.gutenberg-e.org/lowengard/A_Chap03.html http://www.gutenberg-e.org/lowengard/glossShell.ht...