Abstraction-based summarization is more commonly known as abstractive summarization. Truely abstractive summarization may include:
1. sentence reduction
2. sentence compression
3. sentence reformulation
Researchers at RALI, under the direction of Guy Lapalme, have been working in automatic summarization for many years.
Since 2002, RALI has systematically participated in competitions of Document Understanding Conferences (DUC), more recently Text Analysis Conference (TAC).
SumUM was developed by Horacio Saggion in his Ph.D. thesis (1997-2000)….
SumUM produces a summary in two steps: first an indicative summary, which identifies important subjects of a document; then an informative summary is produced which elaborates a few subjects selected by the user.
For more references, see my quick and dirty webpage:
· Abstractive Summarization 2013 | Meta-Guide.com