The complexity of non-hierarchical clustering with instance and cluster level constraints.

Ian Davidson S. S. Ravi The complexity of non-hierarchical clustering with instance and cluster level constraints. 25-61 2007 14 Data Min. Knowl. Discov. 1 http://dx.doi.org/10.1007/s10618-006-0053-7 db/journals/datamine/datamine14.html#DavidsonR07