@article{Rousseeuw1987,
author = {Rousseeuw, P.},
title= {Silhouettes: A graphical aid to the interpretation and validation of cluster analysis},
year = {1987},
doi = {10.1016/0377-0427(87)90125-7},
journal = {Computational and Applied Mathematics},
volume = {20},
pages = {53--65},
}