Bibliographies ; Bundesrepublik Deutschland; Federal Republic of Germany; BRD; Germany ; Meta analysis; Literaturstudie; Literature review; Scientific review ; History of linguistics (20th century) ; State of the art ; Spoken language ; Sociodialectology ; Einfluss von Sprachen aufeinander; Sprachberührung; Areallinguistik; Languages in contact ; Language variation/Dialectology ; Italian