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4ο Υδρογεωλογικό Συνέδριο, Θεσσαλονίκη, 14-16/11/1997, Πρακτικά, 539-546, 1997. Filippidis A., Kassoli-Fournaraki A., Charistos D., Tsirambides A. (1997).
4ο Υδρογεωλογικό Συνέδριο, Θεσσαλονίκη, 14-16/11/1997, Πρακτικά, 539-546, 1997.

Filippidis A., Kassoli-Fournaraki A., Charistos D., Tsirambides A. (1997). Greek zeolites, a material for removing trace elements and neutralizing the pH of water. 4th Hydrogeological Congress, Thessaloniki, Greece, 14-16/11/1997, Proceedings, 539-546 (in Greek with English abstract).