@article{Eyton1984,
author = {Eyton, J.R.},
title= {Complementary-color, two-variable maps},
year = {1984},
doi = {10.1111/j.1467-8306.1984.tb01469.x},
journal = {Annals of the Association of American Geographers},
volume = {74},
number = {3},
pages = {477--490},
}