@article{Stigum1994,
author = {Stigum, H. and Falck, W. and Magnus, P.},
title= {The core group revisited: the effect of partner mixing and migration on the spread of gonorrhea, chlamydia, and HIV},
year = {1994},
doi = {10.1016/0025-5564(94)90036-1},
journal = {Mathematical Biosciences},
volume = {120},
number = {1},
pages = {1--23},
}