%0 Journal Article %A D F Roberts %T The genetic basis of variation in factor 8 levels among haemophiliacs. %D 1971 %R 10.1136/jmg.8.2.136 %J Journal of Medical Genetics %P 136-139 %V 8 %N 2 %U https://jmg.bmj.com/content/jmedgenet/8/2/136.full.pdf