human: Given a node-centered hypergraph: <hypergraph>, where nodes represent authors and hyperedges represent groups of authors who co-authored the same paper.

Details of the hypergraph:
Center node: "BORIS -- An Experiment in In-Depth Understanding of Narratives."
  Abstract: Abstract    boris  is an experimental story understanding and question answering system which deals with the specification and interaction of many sources of knowledge. Unlike skimmers, which simply extract the “gist” of a story in a top-down manner and ignore everything else,  boris  attempts to understand everything that it reads to as great a depth as possible. This report focuses on how the  boris  program handles a complex story involving a divorce.

Connected through hyperedge HE-1 (induced by source paper "An episodic knowledge representation for narrative texts"):
  with members:
    - "TENSE TREES AS THE "FINE STRUCTURE" OF DISCOURSE"

Connected through hyperedge HE-2 (induced by source paper "An overview of KRL, a Knowledge Representation Language"):
  with members:
    - "MULTI - a LISP based multiprocessing system"
    - "The tractability of subsumption in frame-based description languages"
    - "GUS, a frame-driven dialog system"
    - "Six topics in search of a parser: an overview of AI language research"
    - "The Programming Language Aspects of ThingLab, a Constraint-Oriented Simulation Laboratory"
    - "The prolog phenomenon"
    - "A knowledge-based application definition system"

Question: Please tell me which research area the center author belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science