Steffen Grossmann Sebastian Bauer Peter N. Robinson Martin Vingron An Improved Statistic for Detecting Over-Represented Gene Ontology Annotations in Gene Sets. 85-98 2006 conf/recomb/2006 RECOMB http://dx.doi.org/10.1007/11732990_9 db/conf/recomb/recomb2006.html#GrossmannBRV06