On the function of "least-cost path" calculations within the project Tabula Imperii Byzantini (TIB) of the Austrian Academy of Sciences: a case study on the route Melnik-Zlatolist (Bulgaria) - Popović, Mihailo (Anzeiger der philosophisch-historischen Klasse (Österreichische Akademie der Wissenschaften), 145,2 (2010), 2010)