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http://citeseer.ist.psu.edu/cache/papers/cs/2226/http:zSzzSzwww.sikt.hk-r.sezSz~soczSzpublicationszSz.zSz1996zSzeirgp.pdf/evolving-integer-recurrences-using.pdf",
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Shelf mark A-26012 CWI library 2-12-98",
Genetic Programming entries for Stefan J Johansson