S. Wittenberg: Pinhole eyewear systems: a special report. In: Journal of the American Optometric Association. Bd. 64, Nr. 2, February 1993, ISSN0003-0244, S. 112–116, PMID 8436795.
S. Wittenberg: Pinhole eyewear systems: a special report. In: Journal of the American Optometric Association. Bd. 64, Nr. 2, February 1993, ISSN0003-0244, S. 112–116, PMID 8436795.