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WikiPedia: Thị_kính http://members.shaw.ca/quadibloc/science/opt04.htm http://www.astrosurf.com/re/evolution_of_eyepieces... http://www.freepatentsonline.com/4749271.pdf http://www.optics.arizona.edu/detlab/Classes/Opti3... http://www.brayebrookobservatory.org/BrayObsWebSit... http://www.brayebrookobservatory.org/BrayObsWebSit... https://books.google.com/books?id=wrtFcUEIWTgC&pg=... https://commons.wikimedia.org/wiki/Category:Ocular...