Management challenges in the 21st century managing the unexpected: crisis and its impact on companies doing business in Slovakia - Ferenčíková, Soňa, 1960-; Šestáková, Monika; Danišková, Zuzana; Hansenová, Heda; Hvorecký, Jozef; Kelemen, Jozef (Vysoká škola manažmentu v Trenčíne, 2009)