ŠEVELA, Marcel. Efficiency development of Czech foreign trade in high-technology products and high-value agricultural products. In Agricultural economics : an international journal = mezinárodní vědecký časopis. - Prague : Institute of Agricultural and Food Information, 2003. ISSN 0139-570X, 2003, roč. 49, č. 10, s. 476-482. Dostupné na : <http://www.agriculturejournals.cz/publicFiles/59476.pdf>