David Ullrich and Vratislav Pokorný, “Human Factors and Management Limit Situations,” Proceedings of the 29th International Business Information Management Association (IBIMA), ISBN: 978-0-9860419-7-6, 3-4 May 2017, Vienna, Austria, p. 983-988.

Eva Ambrozová, Jiří Koleňák, David Ullrich, Vratislav Pokorný, “Corporate environment and the abilities required of professional managers,” Proceedings of the 25th International Business Information Management Association (IBIMA), ISBN: 978-0-9860419-4-5, 7-8 May 2015, Amsterdam, Netherlands, p. 753-769.