Why direct democracy has not became a modern form of government?

KOPER, Ján. Why direct democracy has not became a modern form of government? In SGEM 2015 : 2nd international multidisciplinary scientific conference on social sciences and arts SGEM 2015, 26 August - 1 September 2015, Albena Bulgaria. Vol. I, book 2.Law. Political sciences. 1. vyd. - Sofia : STEF92, 2015. ISBN 978-619-7105-46-9. ISSN 2367-5659, s. 465-472.