@article{Flowerdew1982,
author = {Flowerdew, R. and Aitkin, M.},
title= {A method of fitting the gravity model based on the Poisson distribution},
year = {1982},
doi = {10.1111/j.1467-9787.1982.tb00744.x},
journal = {Journal of Regional Sciences},
volume = {22},
number = {2},
pages = {191--202},
}