Martin Maechler, based on S original by Peter Rousseeuw
        <rousse@uia.ua.ac.be>, Anja.Struyf@uia.ua.ac.be and
        Mia.Hubert@uia.ua.ac.be, and initial R port by
        Kurt.Hornik@R-project.org
Cluster Analysis Extended Rousseeuw et al.
Cluster Analysis, extended original from Peter Rousseeuw,
        Anja Struyf and Mia Hubert.
two small examples using MASS' cov.rob() and mvrnorm()