http://www.mts.jhu.edu/~priebe/cccd4lcd.html
class cover catch digraphs for latent class discovery
C.E. Priebe, J.L. Solka, D.J. Marchette, and B.T. Clark,
"Class Cover Catch Digraphs for Latent Class Discovery
in Gene Expression Monitoring by DNA Microarrays",
CSDA, 2003.
rev_cccd4lcd.ps.gz