Huseyin Hakkoymaz Georgios Chatzimilioudis Dimitrios Gunopulos Heikki Mannila Applying Electromagnetic Field Theory Concepts to Clustering with Constraints. 485-500 2009 ECML/PKDD (1) http://dx.doi.org/10.1007/978-3-642-04180-8_49 conf/pkdd/2009-1 db/conf/pkdd/pkdd2009-1.html#HakkoymazCGM09