Relevant papers:
- Tree-pattern-based duplicate code detection. HS Lee, KG Doh. Proceeding of the ACM first international workshop on Data-intensive software management and mining (2009) pp. 7-12
- Anti-unification algorithms and their applications in program analysis. P Bulychev, E Kostylev, V Zakharov. Perspectives of Systems Informatics (2010) pp. 413-423