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 "Web data integration for e-commerce applications"):
  Abstract: To make them flexible, scalable, and useable, e-commerce applications require systematic development, including data integration. Traditionally, the integration proceeds in a bottom-up way. This article discusses the problems and proposes a top-down approach to overcome some of the problems. A combined yo-yo approach aims to exploit both strategies' benefits.

Includes members:
  Member "Methodology of schema integration for new database applications: a practitioner's approach":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Federated database systems for managing distributed, heterogeneous, and autonomous databases")
  Member "Kopplungsstrategien für Anwendungssysteme im Krankenhaus":
    also connected through other hyperedges:
      (none)

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