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Terje Dokland, Mary Mah-Lee Ng: Techniques in microscopy for biomedical applications. 2006, ISBN 981-256-434-9, S.23 (google.com [abgerufen am 23. Februar 2012]).
ox.ac.uk
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Sphaera—Peter Dollond answers Jesse Ramsden. Abgerufen am 31. Juli 2009. A review of the events of the invention of the achromatic doublet with emphasis on the roles of Hall, Bass, John Dollond and others.