Retzlaff, John A. Lens implant power calculation : a manual for opthalmologists and biometrists / (by) John A. Retzlaff, Donald R. Sanders , Manus Kraff - 3rd ed. - New Jersey : SLACK Inc, 1990. - 58 p. : ill. ; 28 cm. ISBN: 1556421869 LCCN: 90-053345 Subjects--Topical Terms: Lenses, Intraocular--instrumentation. National Library of Medicine Call No.: WW263 / .R441m 1990 9