GAYRİMENKUL YATIRIMLARINDA ALTERNATİF BİR YATIRIM ARACI OLARAK GAYRİMENKUL SERTİFİKASI (REAL ESTATE CERTIFICATES AS AN ALTERNATIVE INVESTMENT INSTRUMENT IN REAL ESTATE INVESTMENTS) - Erol DEMİR -Emrullah TÖREMEN | The Journal of Academic Social Science Studies