Reihe Lecture Notes in Computer ScienceAndrzej Skowron × Computation TheoryFifth Symposium, Zaborow, Poland, December 3-8, 1984 ProceedingsAndrzej SkowronSpringer BerlineBook2005 Computation TheoryFifth Symposium, Zaborow, Poland, December 3-8, 1984 ProceedingsAndrzej SkowronSpringer BerlinSoftcover1985