1. Knops-Helgeson (Kna), a high frequency erythrocyte antigen;Helgeson;Transfusion,1970
2. A new antigen, Yka, and its relationship to Csa (Cost);Molthan;Vox Sang,1975
3. A new antigen, McCa (McCoy), and its relationship to Kna (Knops);Molthan;Transfusion,1978
4. A new high incidence blood group factor, Sla; and its hypothetical allele;Lacey;Transfusion,1980
5. Expansion of the York, Cost, McCoy, Knops blood group system: the new McCoy antigens McC and McC4;Molthan;Med Lab Sci,1983