Jörg-Matthias Rothe
RAIRO – Informatique Théoretique et Applications 33(2):159–176, 1999
Tech. report TR679, Univ. of Rochester, Dept. of Computer Science, Jan 1998
ftp://ftp.cs.rochester.edu/pub/papers/theory/98.tr679.Immunity_and_simplicity_for_exact_counting_and_other_classes.ps.gz
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