F. Murtagh and P. Contreras, Methods of Hierarchical Clustering. Computing Research Repository-CORR, 2011.
DOI : 10.1002/widm.53

N. Mäkelä, M. Stenroos, and J. Sarvas, Truncated RAP-MUSIC (TRAP-MUSIC) for MEG and EEG source localization, NeuroImage, vol.167, pp.73-83, 2018.