Srinika Jayaratne, Rona L. Levy (1979) "Empirical Clinical Practice", ISBN0-231-04188-8, p. 110
Hans-Jürgen Zimmermann (2001) "Fuzzy Set Theory--and Its Applications", ISBN0-7923-7435-5, p. 278
"Contemporary Geodesy" (Proceedings of a Conference Held at the Harvard College Observatory - Smithsonian Astrophysical Observatory, Cambridge, MA, December 1–2, 1958). P. 68 says: "Now the first type of optical tracking, the most elementary, is that using merely the naked eye — as I heard a Navy man say the other day, 'Mark I eyeball' ".
doi.org
dx.doi.org
J. W. Schoonahd; J. D. Gould; L. A. Miller (July 1973), «Studies of Visual Inspection», Ergonomics (Taylor & Francis) 16 (4): 365-379, PMID28086275, doi:10.1080/00140137308924528.
nih.gov
ncbi.nlm.nih.gov
J. W. Schoonahd; J. D. Gould; L. A. Miller (July 1973), «Studies of Visual Inspection», Ergonomics (Taylor & Francis) 16 (4): 365-379, PMID28086275, doi:10.1080/00140137308924528.