Effectiveness of the swellex rock reinforcement system in the Madem Lakkos and Olympias minesEffectiveness of the swellex rock reinforcement system in the Madem Lakkos and Olympias mines Δημοσίευση σε Συνέδριο Conference Publication 2015-11-162000enhttp://creativecommons.org/licenses/by/4.0/3rd National Congress of Mineral Wealth Tsoutrelis C. Mavrigiannakis Stelios Μαυριγιαννακης Στελιος Roumpos V. Engineering, Mining Mines and mining Mining mining engineering engineering mining mines and mining mining