  In digital libraries recommendations can be valuable for researchers, e.g.
recommending related literature to a given context. Typically, in a scientific
context the simple presentation of related content is not sufficient. Often the
users demand a more detailed view on the connection of a document and its
specific recommendations. The aim of pennants introduced by Howard White (2007)
is to provide the user with a graph showing the relatedness / distance between
a given document and related documents. Co-citation but also co-occurrence
analysis are established methods for finding related documents to a seed. A
seed could be for instance an author, a keyword, or a publication. In this
paper we introduce a recommender system in the digital library sowiport using
pennant diagrams which can be created from co-citation and/or co-occurrence
analysis. The presentation at the NKOS workshop will present demos of pennants
in sowiport and will elaborate on practical questions in visualizing pennants
and evaluating the utility of pennants for search.
