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Holec, Jan (1968-), Necasova, M, Soukup, Josef, Hamouz, P 2009 Changes in weed flora during 20th century - a case study on the area of Czech Republic. In: Weeds and biodiversity : 3rd workshop of the EWRS working group, 12-13 march 2009 Lleida (Spain). Universitat de Lleida, [S.l.].