Cluster validity indices with respect to the value of <i>α</i> (a, b, c, d) and the number of clusters (e). ParisotSarah DarlixAmélie BaumannCédric ZouaouiSonia YordanovaYordanka BlonskiMarie RigauValérie ChemounyStéphane TaillandierLuc BauchetLuc DuffauHugues ParagiosNikos 2016 <p>Dunn index (a), Davies Bouldin index (b), Silhouette index (c) and combined indices (d, e).</p>