RT Journal Article
SR Electronic
T1 A ROTATING CROSS-CYLINDER
JF British Journal of Ophthalmology
JO Br J Ophthalmol
FD BMJ Publishing Group Ltd.
SP 632
OP 633
DO 10.1136/bjo.23.9.632
VO 23
IS 9
A1 M. Tree
YR 1939
UL http://bjo.bmj.com/content/23/9/632.abstract
AB