In this article, Bob Sokal innovates on two points. First, instead of focusing on allele frequencies, understood only as sampled values of the continuum at different localities, he turned to local variations in these frequencies, as estimated in each square of a grid. Second, he created an ethnohistorical database used to quantify the multitude of population movements in localities on the map.
"Commentary on Sokal's "Ancient Movement Patterns Determine Modern Genetic Variances in Europe" (1991),"
5, Article 7.
Available at: https://digitalcommons.wayne.edu/humbiol/vol84/iss5/7