This author has not been identified. Look up 'Georgios Chalkiadakis' in GoogleThis author has not been identified. Look up 'Edith Elkind' in GoogleThis author has not been identified. Look up 'Evangelos Markakis' in GoogleThis author has not been identified. Look up 'Maria Polukarov' in GoogleThis author has not been identified. It may be one of the following persons: Look up 'Nicholas R. Jennings' in Google