TY - JOUR A1 - Stigum, H. A1 - Falck, W. A1 - Magnus, P. T1 - The core group revisited: the effect of partner mixing and migration on the spread of gonorrhea, chlamydia, and HIV Y1 - 1994 DO - 10.1016/0025-5564(94)90036-1 JF - Mathematical Biosciences VL - 120 IS - 1 SP - 1 EP - -23 ER -