After having published this paper here, we discovered that it is part of a series of three papers of which two others were published as

1. Zuosong Liang, Erfang Shan, T. C. E. Cheng ``Clique-Transversal Sets in Cubic Graphs'', in B. Chen, M. Paterson, and G. Zhang (Eds.): ESCAPE 2007, LNCS 4614, Springer Verlag, pp. 107-115, 2007
2. ErFang SHAN, T.C.E. CHENG, LiYing KANG, ``Bounds on the clique-transversal number of regular graphs'', in Science in China Series A: Mathematics, Vol. 51, No. 5, pp. 851-­863, May, 2008

Proceedings contribution (1) is a textual copy (besides LaTeX style changes) of the initial version that was submitted to DMTCS. The final version of the DMTCS paper does not cite (1).

Journal paper (2) has an significant overlap with (1) and this paper here. It cites (1) only marginal.

None of the papers compares its contribution with respect to the other two papers.

The knowledge of the intersection of these papers would have been crucial for the editorial teams that decided on the publication of theses papers.

In particular if we, DMTCS, would have had knowledge of (1) at the time of submission we would have rejected the present paper immediately without going through a detailed reviewing. A renewed publication of a proceedings contribution without any additional material is a violation of two principles to which we are fundamentally attached:

• the new publication is no original work
• the new publication violates the copyright of the proceedings publication

Unfortunately we cannot ``undo'' a publication. But we decided to withdrawn this paper from any further distribution for which are responsible be it electronic or other form. DMTCS renounces of any copyright or other responsibility with respect to this publication and demands that all citations that are made to this work refers to (1) or (2) as appropriate.