@article{Carstensen Jr.1986,
author = {Carstensen Jr., L.W.},
title= {Hypothesis testing using univariate and bivariate choropleth maps},
year = {1986},
doi = {10.1559/152304086783899935},
URL = {https://doi.org/10.1559/152304086783899935},
volume = {13},
number = {3},
pages = {231‒251},
}