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WikiPedia: Kính_vật http://members.shaw.ca/quadibloc/science/opt04.htm http://www.astrosurf.com/re/evolution_of_eyepieces... http://www.freepatentsonline.com/4749271.pdf http://www.olympusmicro.com/primer/anatomy/objecti... http://www.optics.arizona.edu/detlab/Classes/Opti3... http://www.brayebrookobservatory.org/BrayObsWebSit... http://www.mhs.ox.ac.uk/cameras/index.htm?item52 https://web.archive.org/web/20081101133539/http://... https://commons.wikimedia.org/wiki/Category:Ocular...