@article{Strang1993,
author = {Strang, D. and Tuma, N.B.},
title= {Spatial and Temporal Heterogeneity in Diffusion},
year = {1993},
doi = {10.1086/230318},
journal = {American Journal of Sociology},
volume = {99},
number = {3},
pages = {614--639},
}