TY - RPRT TI - Neisserial surface variation: how and why? AU - J Swanson AU - R J Belland AU - S A Hill PY - 1992 DO - 10.1016/s0959-437x(05)80143-1 UR - https://pubmed.ncbi.nlm.nih.gov/1360853/ ID - 1360853 ER -