decis ec turkei associ council april open negoti aim liberalis servic mutual open procur market commun turkei ec associ council regard agreement septemb establish associ european econom commun turkei articl thereof regard addit protocol articl thereof regard decis ec turkei associ council decemb implement final phase custom union articl thereof articl ec turkei associ agreement articl addit protocol thereto envisag decis associ council progress abolit restrict freedom provid servic freedom establish relev provis treati establish european commun guidelin articl decis associ council set date initi negoti aim mutual open parti respect procur market negoti guidelin decis ec turkei associ council liberalis servic procur adopt council novemb council reaffirm willing conclud decis turkei decid sole articl negoti aim liberalis servic mutual open procur market commun turkei begin april luxembourg april associ council presid cem oj oj oj