@article{Kretzschmar1996,
author = {Kretzschmar, M. and Morris, M.},
title= {Measures of concurrency in networks and the spread of infectious disease},
year = {1996},
doi = {10.1016/0025-5564(95)00093-3},
journal = {Mathematical Biosciences},
volume = {133},
number = {2},
pages = {165--195},
}