Ε.Σ.Σ.Ε. της επιχείρησης ΚΩΝΣΤΑΝΤΙΝΟΣ Γ. ΗΛΙΟΣ Α.Ε. ΞΕΝΟΔΟΧΕΙΑΚΕΣ ΤΟΥΡΙΣΤΙΚΕΣ ΕΠΙΧΕΙΡΗΣΕΙΣ
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[1] https://www.omed.gr/el/content/%CE%BA%CF%89%CE%BD%CF%83%CF%84%CE%B1%CE%BD%CF%84%CE%B9%CE%BD%CE%BF%CF%83-%CE%B3-%CE%B7%CE%BB%CE%B9%CE%BF%CF%83-%CE%B1%CE%B5-%CE%BE%CE%B5%CE%BD%CE%BF%CE%B4%CE%BF%CF%87%CE%B5%CE%B9%CE%B1%CE%BA%CE%B5%CF%83-%CF%84%CE%BF%CF%85%CF%81%CE%B9%CF%83%CF%84%CE%B9%CE%BA%CE%B5%CF%83-%CE%B5%CF%80%CE%B9%CF%87%CE%B5%CE%B9%CF%81%CE%B7%CF%83%CE%B5%CE%B9%CF%83-2016
[2] https://www.omed.gr/el/content/%CE%BA%CF%89%CE%BD%CF%83%CF%84%CE%B1%CE%BD%CF%84%CE%B9%CE%BD%CE%BF%CF%83-%CE%B3-%CE%B7%CE%BB%CE%B9%CE%BF%CF%83-%CE%B1%CE%B5-%CE%BE%CE%B5%CE%BD%CE%BF%CE%B4%CE%BF%CF%87%CE%B5%CE%B9%CE%B1%CE%BA%CE%B5%CF%83-%CF%84%CE%BF%CF%85%CF%81%CE%B9%CF%83%CF%84%CE%B9%CE%BA%CE%B5%CF%83-%CE%B5%CF%80%CE%B9%CF%87%CE%B5%CE%B9%CF%81%CE%B7%CF%83%CE%B5%CE%B9%CF%83-2012