<https://periodikostep.gr/#organization>
<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>
<http://schema.org/Organization>
<https://periodikostep.gr/%CF%83%CF%85%CE%BD%CE%B5%CE%BB%CE%AE%CF%86%CE%B8%CE%B7-%CE%B1%CE%BD%CE%AE%CE%BB%CE%B9%CE%BA%CE%BF%CF%82-%CE%B3%CE%B9%CE%B1-%CE%BB%CE%B7%CF%83%CF%84%CE%B5%CE%AF%CE%B1-%CF%83%CE%B5-%CE%B2%CE%AC%CF%81/>