1. Speech analysis by clustering, or the hyperphomene method;Astrahan,1970
2. PROMENADE, An one-line Pattern Recognition;Ball,1967
3. A minimum spanning tree based probability density estimation procedure;Chaudhuri;IEEE Trans. Pattern Anal. Machine Intell.,1993
4. Some methods for classification and analysis of multivariate observations;MacQueen,1967
5. MIKCA: A FORTRAN IV iterative K-means cluster analysis program;McRae;Behavioral Sci.,1971