@article{CM2007,
 author = {David Maxwell Chickering and Christopher Meek},
 title = {On the incompatibility of faithfulness and monotone DAG faithfulness},
 journal = {Artificial Intelligence},
 volume = {170},
 number = {8},
 year = {2006},
 issn = {0004-3702},
 pages = {653--666},
 doi = {http://dx.doi.org/10.1016/j.artint.2006.03.001},
 publisher = {Elsevier Science Publishers Ltd.},
 address = {Essex, UK},
 }