Ontrup, J. ; Ritter, H. ; Scholz, S. ; Wagner, R.:
{D}etecting, {A}ssessing and {M}onitoring {R}elevant {T}opics in {V}irtual {I}nformation {E}nvironments.
In: {IEEE} {T}ransactions on {K}nowledge and {D}ata {E}ngineering,
21
(2009),
Nr. 3,
S. 415 - 427