title: Ethnic contact index as a tool for studying territories with a mixed national composition of the population
abstract: Territories with a mixed ethnic composition of the population are complex phenomena. Ethnocontact zones belong to the same type of formations. In domestic science, the index of ethnic mosaic proposed by B. M. Ekkel is the main quantitative indicator used in the identification of multicomponent ethno-contact zones. The Eckel index is convenient for displaying on a map, but subsequent ethnogeographical analysis needs additional information that is difficult to map. This shortcoming can be avoided 
journal: Pskov region studies journal