This k-means clustering tutorial was cited by the following paper. If you know other paper, please drop me a note. I may put link to your paper.
Citation for this tutorial
Lucas, Maria do Carmo R. et al, TECNOLOGIAS DE INFORMA��O GEOGR�FICA: MAIS UM INSTRUMENTO PARA A QUALIDADE NA SAUDE .
Bo Wang, Semantic Web Portal for Machine Learning , University of Bristol, 2004.