title: data bubbles : quality preserving performance boosting for hierarchical clustering sigmod conference 2001. authors: m breunig , h kriegel , p krіger , j sander. venue: nan. year: nan
title: data bubbles : quality preserving performance boosting proc . acm sigmod ,. authors: m breuning , hp kriegel , p krã ¶ ger , j sander. venue: nan. year: nan