1. Ecole d'eté de probabilités de St.-Flour;Dudley,1984
2. Cluster Analysis;Everitt,1974
3. When does the k-nearest neighbors graph contain the MST?;González-Barrios;Comunicación Técnica del CIMAT,1995
4. Agglomerative clustering using the concept of mutual nearest neighborhood;Gowda;Pattern Recognition,1978
5. Graph Theory;Harary,1969