RT Journal Article SR Electronic T1 Microdiffusion Analysis and Volumetric Error JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 307 OP 307 DO 10.1136/oem.19.4.307-a VO 19 IS 4 A1 Roach, S. A. YR 1962 UL http://oem.bmj.com/content/19/4/307.2.abstract AB