González-Alcalde, J. and Sáez-Dégano, J.A. 2010. Microscopes of the 18th Century in the Natural Science Museum. Csic. Two Unique Pieces from the Enlightenment Period for the Naturalistic Research. Arbor. 186, 745 (Oct. 2010), 983–991. DOI:https://doi.org/10.3989/arbor.2010.745n12ac.