1. Knops-Helgeson (Kna), a high frequency erythrocyte antigen;Helgeson;Transfusion,1970
2. The serology of the York-Cost-McCoy-Knops red blood cell system;Molthan;Am J Med Technol,1983
3. The C3b/C4b receptor is recognized by the Knops, McCoy, Swain-Langley, and York blood group antisera;Moulds;J Exp Med,1991
4. Identification of human erythrocyte blood group antigens on the C3b/C4b receptor;Rao;J Immunol,1991
5. Antiglobulin testing for CR1-related (Knops/McCoy/Swain-Langley/York) blood group antigens: negative and weak reactions are caused by variable expression of CR1;Moulds;Vox Sang,1992