@incollection{greene08chapter, author = {Derek Greene and P\'{a}draig Cunningham and Rudolf Mayer}, booktitle = {Machine Learning Techniques for Multimedia: Case Studies on Organization and Retrieval}, chapter = {3}, editor = {Matthieu Cord and P\'{a}draig Cunningham}, pages = {51--90}, pdf = {http://www.derekgreene.com/papers/greene08chapter.pdf}, publisher = {Springer}, title = {Unsupervised Learning and Clustering}, year = {2008} }