ALY, Shady - VRANA, Ivan. Toward efficient modeling of fuzzy expert systems: a survey. In Agricultural economics : an international journal = mezinárodní vědecký časopis. - Prague : Institute of Agricultural and Food Information, 2006. ISSN 0139-570X, 2006, vol. 52, no. 10, s. 456-460. Available on Internet: <http://www.agriculturejournals.cz/publicFiles/58062.pdf>