Four colors suffice :
Wilson, Robin
Four colors suffice : how the map problem was solved / Robin Wilson. - Princeton, NJ Princeton University Press 2002 - 262 p. ill. 21 cm.
9780141009087
QA 612.19 / .W746 2002
IB 511.5 / W69 2002
Four colors suffice : how the map problem was solved / Robin Wilson. - Princeton, NJ Princeton University Press 2002 - 262 p. ill. 21 cm.
9780141009087
QA 612.19 / .W746 2002
IB 511.5 / W69 2002