Found in articles
Machine "The First Telescopes". Part of an exhibit from Cosmic Journey: A History of Scientific Cosmology by the American Institute of Physics ESO 100 m
2008. Gibson, B. K. (1991). "Liquid Mirror Telescopes: History". Journal of the Royal Astronomical Society of Canada. 85: 158. Bibcode:1991JRASC..85..158G
June 2012. Vincent Ilardi (2007). Renaissance Vision from Spectacles to Telescopes. American Philosophical Society. p. 210. ISBN 978-0-87169-259-7. Retrieved