%0 Journal Article
%T Knowing what we count: a comment on Guo
%A Petr PyŁżek
%J NeoBiota
%D 2011
%I 
%R 10.3897/neobiota.10.1976
%K alien species richness
%K scale
%K ecology
%K biogeography
%U http://www.pensoft.net/journals/neobiota/article/1976/