Bulgaria as an investment immigration destination

Bulgaria's position as a border country of the European Union makes it a key destination in migration flows. How could this translate into profitable investments in the Bulgarian economy? What is the "fast track" procedure for obtaining Bulgarian citizenship? Answers to these questions can be found in associate Mario Arabistanov's article published in Capital: http://www.capital.bg/biznes/vunshni_analizi/2015/07/29/2582067_bulgariia_kato_migracionna_destinaciia/ .
The article is also available as a pdf file here: http://www.kambourov.biz/en-US/practice-areas/Employment-and-Immigration