HUSÁR, Jaroslav - SZOMOLÁNYI, Karol. The Foreign trade problems: improvement of the stance of the Slovak economy using the model. In Mathematical methods in economics 2003 : proceedings of the 21th international conference, 10-12 September 2003, Prague. - Prague : Czech University of Agriculture in Prague, Faculty of Economics and Management, 2003. ISBN 80-213-1046-4, s. 128-133.