De Filippo, C., Barbieri, C., Whitten, M., Mpoloka, S., Gunnarsdóttir, E., Bostoen, K., et al. (2011).
Y-chromosomal variation in sub-Saharan Africa: Insights into the history of Niger-Congo groups. Molecular
Biology and Evolution, 28(3), 1255-1269. doi:10.1093/molbev/msq312.