In the text of Problem 12.20 we credit this result to R. Häggkvist and J.C.M. Janssen. We note in this connection that we have erroneously given the asymptotic bound as "D + o(1)", which, as it was again kindly pointed out by J. Kahn, should have been "D + o(D)".
June 15, 1995. Tommy R. Jensen
H. Sachs, Coin graphs, polyhedra and conformal mapping, Discrete Math. 134, 133-138, 1994.
August 25, 1997. Tommy R. Jensen
A. Soifer, Mathematical Coloring Book, Center for Excellence in Mathematical Education, to appear.
August 27, 1997. Tommy R. Jensen