1. Agarwal, Y. S. & Singh K. S. (2012). K-means versus k-means++ clustering technique. In Engineering and systems (SCES) (pp. 1–6).
2. How slow is the k-means method?;Arthur,2006
3. k-means++: The advantages of careful seeding;Arthur,2007
4. Scalable k-means++;Bahmani;Proceedings of the VLDB Endowment,2012
5. Brants, T. & Franz, A. (2006). {Web 1T 5-gram Version 1}.