Data Clustering Based on an Efficient Hybrid of K-Harmonic Means, PSO and GA. - Malihe Danesh; Mahmoud Naghibzadeh; Mohammad R. Akbarzadeh-Totonchi; Mohaddeseh Danesh; Behrouz Minaei; Hossein Shirgahi (Trans. Comput. Collect. Intell., 2011)