1. Phylogenetic Supertrees: Combining Information to Reveal the Tree of Life,2004
2. S. Böcker, From subtrees to supertrees, PhD thesis, Universität Bielefeld, 1999.
3. Algorithmic aspects of tree amalgamation;Böcker;J. Algorithms,2000
4. A note on maximal hierarchies;Böcker;Adv. Math.,2000
5. Patchworks;Böcker;Adv. Math.,2001