RT Journal Article SR Electronic T1 Occupational Diseases and Industrial Medicine JF British Journal of Industrial Medicine JO Br J Ind Med FD BMJ Publishing Group Ltd SP 237 OP 237 DO 10.1136/oem.18.3.237 VO 18 IS 3 A1 R. S. F. Schilling YR 1961 UL http://oem.bmj.com/content/18/3/237.1.abstract AB