The four color problem: assaults and conquest.

Eitemau Tebyg

• The four color theorem : history, topological foundations, and idea of proof /
  gan: Fritsch, Rudolf, et al.
  Cyhoeddwyd: (1998)
• The four color theorem : history, topological foundations, and idea of proof /
  gan: Fritsch, Rudolf
  Cyhoeddwyd: (1998)
• An introduction to color.
  gan: Evans, Ralph M. (Ralph Merrill)
  Cyhoeddwyd: (1948)
• The enjoyment and use of color.
  gan: Sargent, Walter
  Cyhoeddwyd: (1964)
• Color: An introdution to practice and principles
  gan: Kuehni, Rolf G