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Kappraff, J. Cecil Balmond, The Number 9: The Search for the Sigma Code – Munich: Prestel,1999. Nexus Netw J 2, 175–176 (2000). https://doi.org/10.1007/s00004-999-0022-8
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DOI: https://doi.org/10.1007/s00004-999-0022-8