@inproceedings{FellowsRosamondRoticsSzeider06,
 author = {Michael R. Fellows and Frances A. Rosamond and Udi Rotics
and Stefan Szeider},
 booktitle = {Proceedings of STOC 2006; the 38th ACM Symposium on Theory
of Computing, Seattle, Washington, USA},
 doi = {10.1145/1132516.1132568},
 pages = {354--362},
 publisher = {ACM},
 title = {Clique-width Minimization is {NP}-hard},
 year = {2006}
}