PORVAZNÍK, Ján - LJUDVIGOVÁ, Ivana. Opportunities and need of use of knowledge of the general theory of systems, cybernetics and evaluation of human competence when dealing with present crisis problems of civilisation. In 3rd international conference on new challenges in management and business. International conference. 3rd international conference on new challenges in management and business : conference proceedings : Dubai, UAE, 2 may, 2016. - [Tehran] : [Industrial Management Institute], 2016. ISBN 978-600-7826-00-3, s. 78 CD-ROM.