@article{Johnston1993,
author = {Johnston, R.J. and Pattie, C.J.},
title= {Entropy-maximizing and the iterative proportional fitting procedure},
year = {1993},
doi = {10.1111/j.0033-0124.1993.00317.x},
journal = {Professional Geographer},
volume = {45},
number = {3},
pages = {317--322},
}