Panagiotis Achlioptas Bernhard Schölkopf Karsten M. Borgwardt Two-locus association mapping in subquadratic time. 726-734 2011 KDD http://doi.acm.org/10.1145/2020408.2020521 conf/kdd/2011 db/conf/kdd/kdd2011.html#AchlioptasSB11