This author has not been identified. Look up 'A. Bakalis' in GoogleThis author has not been identified. Look up 'Costas S. Iliopoulos' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Christos Makris' in GoogleThis author has not been identified. Look up 'Spyros Sioutas' in GoogleThis author has not been identified. Look up 'Evangelos Theodoridis' in GoogleThis author has not been identified. Look up 'Athanasios K. Tsakalidis' in GoogleThis author has not been identified. Look up 'Kostas Tsichlas' in Google