Hradec Economic Days 2019. International Scientific Conference. Hradec Economic Days 2019 (Part I.) : Proceedings of the International Scientific Conference: Innovation and Socio-economic Development, February 5–6, 2019, (Hradec Králové, Czech Republic). Vol. 9(1). 1st Edition. Hradec Králové : University of Hradec Králové, 2019. online 527 s. ISBN 978-80-7435-735-0. ISSN 2464-6059.