Amol Prakash Mathieu Blanchette Saurabh Sinha Martin Tompa Motif Discovery in Heterogeneous Sequence Data. 348-359 2004 conf/psb/2004 Pacific Symposium on Biocomputing http://helix-web.stanford.edu/psb04/prakash.pdf db/conf/psb/psb2004.html#PrakashBST04