Four colors suffice how the map problem was solved
Wilson, R
Four colors suffice how the map problem was solved R. Wilson - Princeton Princeton University Press 2014 - xii 199 - Princeton science library .
9780691158228
511.6 / WIL
Four colors suffice how the map problem was solved R. Wilson - Princeton Princeton University Press 2014 - xii 199 - Princeton science library .
9780691158228
511.6 / WIL