An Attempt to Understand the Four Color Problem. Haken, W Journal of Graph Theory, 1977.
bibtex   
@article{Haken1977,
author = {Haken, W},
journal = {Journal of Graph Theory},
keywords = {Ordner-A,funktionale Programmierung FP Backus-FP},
mendeley-tags = {Ordner-A},
title = {{An Attempt to Understand the Four Color Problem}},
volume = {1},
year = {1977}
}
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