The Treasury of Turkey announced it will sell bonds linked to income at four state enterprises. The Treasury will issue the bonds in Turkish Liras and dollars Jan. 28 after collecting bids Jan. 26 and 27. The total issuance will be YTL 1.89 bn, or USD 1.15 bn. The papers will be linked to income at four state enterprises, namely oil company TPAO, the state stationary office DMO, the government-run airports authority DHMI and the coast safety authority, or KIYEM. The Treasury statement did not clarify whether the new revenue-index bonds were compliant with Islamic investment principles. Last month, Selim Ye?ilba?, the head of the international finance markets department at the Turkish Undersecretariat of Treasury, said to Hürriyet Daily News & Economic Review the new borrowing method would be "based on rent certificates."