Twenty years of numerical syntaxonomy.- An outline for data analysis in phyto sociology: past and present.- Influences of the individualistic concept of vegetation on syntaxonomy.- Similarity measures for structured data: a general framework and some applications to vegetation data.- New combinatorial clustering methods.- On the use of grammars in vegetation analysis.- A new numerical solution to traditional phytosociological tabular classification.- Syntaxonomy of the Onopordum acanthium communities in temperate and continental Europe.- A coenocline of the high-ranked syntaxa of ruderal vegetation.- Ecological species groups in forest communities in South Belgium.- On the delimitation of the Mesobromion and Xerobromion in Belgium and French Lorraine.- Classification of South Swedish Isoetid vegetation with the help of numerical methods.- Syntaxonomy of the Australian mangai refined through iterative ordinations.- Numerical revision of the Fagion illyricum alliance.- Numerical syntaxonomy of the tall-forb and tall-grass communities in the Tatra Mountains.- Partitioning and elevation gradient of vegetation from southeastern Ethiopia by probabilistic methods.- Numerical phytosociology of the subalpine belt of the Kazbegi region, Caucasus, USSR.- Phytogeographical analysis of a treeline community in Northern Yukon (NW-Canada).