Since there are no citations which kind of sucks (or did I miss them somehow?)...the 2006 base study mentioned in the article is called: "Computer-assisted navi

Since there are no citations which kind of sucks (or did I miss them somehow?)...the 2006 base study mentioned in the article is called: "Computer-assisted navigation and the acquisition of route and survey knowledge" by Münzer, Zimmer, Schwalm, Baus and Aslan