The manuscript cited as "Abbott and Zhou [1993b]" has appeared

Some remarks on (*k*-1)-critical subgraphs of *k*-critical graphs,
*Combinatorica* **15**, 469-474, 1995.

August 7, 1997. Tommy R. Jensen

The manuscript cited as "Jensen and Royle [1989]" has appeared

T.R. Jensen and G.F. Royle, Small graphs of chromatic number 5 - a
computer search,
*J. Graph Theory* **19**, 107-116, 1995.

August 12, 1997. Tommy R. Jensen

The manuscripts cited as "Su [1994a]" and "Su [1994b]" have appeared

X.-Y. Su, On complete subgraphs of color-critical graphs,
*Discrete Math.* **143**, 243-249, 1995.

X.-Y. Su, Complete (k-1)-subgraphs of k-critical graphs,
*J. Combin. Math. Combin. Comput.* **18**, 186-192, 1995.

August 26, 1997. Tommy R. Jensen

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