PT  - JOURNAL ARTICLE
AU  - Williamson-Noble, F. A.
TI  - A POSSIBLE FALLACY IN THE USE OF THE CROSS-CYLINDER
AID  - 10.1136/bjo.27.1.1
DP  - 1943 Jan 01
TA  - British Journal of Ophthalmology
PG  - 1--12
VI  - 27
IP  - 1
4099  - http://bjo.bmj.com/content/27/1/1.short
4100  - http://bjo.bmj.com/content/27/1/1.full
SO  - Br J Ophthalmol1943 Jan 01; 27