Edward Ochmanski Jerzy Tyszkiewicz Mathematical Foundations of Computer Science 2008, 33rd International Symposium, MFCS 2008, Torun, Poland, August 25-29, 2008, Proceedings 5162 2008 978-3-540-85237-7 MFCS Lecture Notes in Computer Science Springer db/conf/mfcs/mfcs2008.html