human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups authors who co-authored the same paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "Are refactorings less error-prone than other changes?"):
  Abstract: Refactorings are program transformations which should preserve the program behavior. Consequently, we expect that during phases when there are mostly refactorings in the change history of a system, only few new bugs are introduced. For our case study we analyzed the version histories of several open source systems and reconstructed the refactorings performed. Furthermore, we obtained bug reports from various sources depending on the system. Based on this data we identify phases when the above hypothesis holds and those when it doesn't.

Includes members:
  Member "Finding refactorings via change metrics":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Evolving object-oriented designs with refactorings")
  Member "How We Refactor, and How We Know It":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "Are refactoring practices related to clusters in java software")

Question: Please tell me which research area the co-authored paper (i.e., the source paper of the center hyperedge) belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science