https://www.lexpera.com.tr/resmi-gazete/31-10-1990/20681 monthly 2026-07-17T13:32:45Z https://www.lexpera.com.tr/resmi-gazete/metin/devlet-istatistik-enstitusu-baskanligi-danisma-kurullari-ve-arastirma-gruplarinin-kurulus-gorev-ve-2 1990-10-31T00:00:00Z