Papers on Fractional Graph Coloring

All Planar Graphs are 5-colorable, Complete Proof:

All Planar Graphs are 4-colorable, sketch from wikipedia

Fractional graph Theory by by Scheinerman and Ullman. This is a book.

Planar Graphs are 4.5 colorable and have ind ratio at least 0.3… By Cranston and Raybern paper talk