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 "A protocol test generation procedure"):
  Abstract: Abstract   A procedure presented here generates test sequences for checking the conformity of an implementation to the control portion of a protocol specification, which is modeled as a deterministic finite-state machine (FSM). A test sequence generated by the procedure given here tours all state transitions and uses a unique signature for each state, called the Unique Input/Output (UIO) sequence. A UIO sequence for a state is an input/output behavior that is not exhibited by any other state. An algorithm is presented for generating a minimum-length UIO sequence, should it exist, for a given state. UIO sequences may not exist for some states.

Includes members:
  Member "Formal methods for protocol testing: a detailed study":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Test development for communication protocols: towards automation")
  Member "A reduced test suite for protocol conformance testing":
    also connected through other hyperedges:
      - Hyperedge HE-2 (induced by source paper "Toward automatic generation of novice user test scripts")
  Member "Test development for communication protocols: towards automation":
    also connected through other hyperedges:
      - Hyperedge HE-3 (induced by source paper "Formal methods for protocol testing: a detailed study")
  Member "Validation-based test sequence generation for networks of extended finite state machines":
    also connected through other hyperedges:
      - Hyperedge HE-4 (induced by source paper "Formal methods for protocol testing: a detailed study")

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