Appel, K., Haken, W. and Koch, S. (1977) Every Planar Mar Is Four Colorable: Part 2, Reducibility. Illinois Journal of Mathematics, 21, 491-567.

has been cited by the following article:

• TITLE: Four Color Theorem and Applied Geophysics

  AUTHORS: Lev V. Eppelbaum

  KEYWORDS: Logical-Heuristic Model; Geophysical Method Integration; Geophysical Map Coloring

  JOURNAL NAME: Applied Mathematics, Vol.5 No.4, March 10, 2014

  ABSTRACT: A selection of a number of geophysical methods to solve different geological, geodynamical, environmental, archaeological and other problems usually has no theoretical substantiation. The solution to this “four color” mathematical problem is able to assume that two independent geophysical methods are sufficient theoretically to characterize the geological-geophysical peculiarities of the area under study.