HAJDUOVÁ, Zuzana - PIĽA, Ján - ANDREJKOVIČ, Marek. The flights in Košice and Poprad before crisis. In Acta avionica. - Košice : Technical University Kosice, Faculty of aeronautics, 2010. ISSN 1335-9479, 2010, vol. XII, č. 19, s. 92-96.