Wilson, Robin
Four colors suffice How the map problem was solved - Revised color edition - New Jersey Princeton university press 2013 - 199 - Promceton Science Library .
9780691158228
Four color problem, four color problem history,
511 WIL
Four colors suffice How the map problem was solved - Revised color edition - New Jersey Princeton university press 2013 - 199 - Promceton Science Library .
9780691158228
Four color problem, four color problem history,
511 WIL