TY - JOUR T1 - Combining numerical and traditional approaches to classify Echinops sphaerocephalus invaded communities in the Czech Republik JF - Phytocoenologia Y1 - 2009 A1 - Petřík, P. A1 - Dostálek, J. A1 - Neuhäuslová, Z. SP - 253 EP - 264 VL - 39 ER -