https://aristeia.news/robert-putnam-%cf%83%cf%85%ce%bc%ce%bc%ce%b5%cf%84%ce%bf%cf%87%ce%ae-%cf%83%cf%84%ce%b1-%ce%ba%ce%bf%ce%b9%ce%bd%ce%ac-%ce%ba%ce%b1%ce%b9-%ce%ba%ce%bf%ce%b9%ce%bd%cf%89%ce%bd%ce%b9%ce%ba%cf%8c-%ce%ba/