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Anthony Auerbach
L. A. Necker: Observations on some Remarkable Phænomena

L. A. Necker: 'Observations on some Remarkable Phænomena seen in Switzerland; and an Optical Phænomenon which Occurs on Viewing a Figure of a Crystal or Geometrical Solid', The London and Edinburgh Philosophical Magazine and Journal of Science, Third Series, 1, (1832)