Krause, Johannes Archaeogenetics, Max Planck Institute for the Science of Human History, Max Planck Society;
Haak, W., Lazaridis, I., Patterson, N., Rohland, N., Mallick, S., Llamas, B., et al. (2015). Massive migration from the steppe was a source for Indo-European languages in Europe. Nature, 522(7555), 207-211. doi:10.1038/nature14317.