TY  - BOOK
AU  - Peckham, R. H and Arner, W. J
TI  - Visual acuity, contrast, and flicker, as measures of retinal sensitivity
PY  - 1952///
UR  - http://14.139.222.13:80/cgi-bin/koha/opac-detail.pl?biblionumber=1428
ER  -