@book{ Solr-417482, title = {Migration and settlement in Bulgaria}, series = {International Institute for Applied Systems Analysis. Research memorandum ;}, author = {Filipov, Dimitù†r}, editor = {International Institute for Applied Systems Analysis}, address = {Laxenburg, Austria}, publisher = {International Institute for Applied Systems Analysis}, year = {1978}, pages = {97}, note = {"August 1978."}, }