RT Journal Article SR Electronic T1 The Elements of Cytogenetics JF Journal of Medical Genetics JO J Med Genet FD BMJ Publishing Group Ltd SP 191 OP 191 DO 10.1136/jmg.7.2.191-b VO 7 IS 2 A1 John L. Hamerton YR 1970 UL http://jmg.bmj.com/content/7/2/191.3.abstract AB