Charalampos Vasilatos Ioannis Mitsis Maria  Andreadi Spyridoula Giannatou Vaios Karayannis Nikolaos Koukouzas Michael Stamatakis, VALORISATION OF GREEK LIGNITE FLY ASH FOR THE SYNTHESIS OF DIFFERENT LOW COST ZEOLITES, SUITABLE FOR ENVIRONMENTAL AND AGRICULTURAL APPLICATIONS, 27-33, 2020, PRE Conference Series,