RISC RISC Research Institute for Symbolic Computation  
  • @techreport{RISC1592,
    author = {Peter Hirt},
    title = {{AIPC: An Assitant for Interactive Proof Construction Using Natural Deduction}},
    number = {95-48},
    year = {1995},
    type = {RISC Report Series},
    institution = {Research Institute for Symbolic Computation (RISC), Johannes Kepler University Linz},
    address = {Schloss Hagenberg, 4232 Hagenberg, Austria}
    }