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Main Title = "Some model approaches of natural resources efficiency evaluation"
- TVRDOŇ, Jiří. Some model approaches of natural resources efficiency evaluation. In Agricultural economics : an international journal = mezinárodní vědecký časopis. - Prague : Institute of Agricultural and Food Information, 2005. ISSN 0139-570X, 2005, vol. 51, no. 2, s. 47-50. Available on Internet: <http://www.agriculturejournals.cz/publicFiles/58219.pdf>