M
[MO97] Dieter van Melkebeek and Mitsunori Ogihara. Sparse Hard Sets for P. In Ding-zhu Du and Ker-I Ko (eds.), Advances in Algorithms, Languages and Complexity. Kluwer Academic, 1997. 
@incollection{AALC1997-MO,
  author =              {Melkebeek, Dieter van and Ogihara, Mitsunori},
  title =               {Sparse Hard Sets for~{P}},
  editor =              {Du, Ding-zhu and Ko, Ker-I},
  booktitle =           {Advances in Algorithms, Languages and Complexity},
  publisher =           {Kluwer Academic},
  pages =               {191-208},
  year =                {1997},
}
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