LeNet [ label=<LeNetcite{lecun1990handwritten}> ]

./example.tex:30:Use of Gin@ii doesn't match its definition }

documentclass[a4paper,10pt]{article}
usepackage[psfrag]{graphviz}
begin{document}

Some text with a citation~cite{book1}.

psfrag{lenetref}[cc][cc]{Lenetcite{book1}}
psfrag{neocognitronref}[cc][cc]{NeoCognitroncite{misc1}}
psfrag{backproprefabcdef}[cc][cc]{BackPropagationcite{article1}}
Large
digraph{bibliography}{
  {
  /* Timeline */
  node[shape=plaintext, fontsize=15];
  1980 -> 1985 -> 1990;
  }

  /* Papers */
  {
  node[shape=plaintext, fontsize=13];
  NeoCognitron [ label=<neocognitronref> ]
  BackPropagation [ label=<backproprefabcdef> ]
  LeNet [ label=<lenetref> ]
  }

  /* Year-paper relation */
  { rank=same; 1980; NeoCognitron; }
  { rank=same; 1985; BackPropagation; }
  { rank=same; 1990; LeNet; }

  /* Paper-to-paper influence */
  BackPropagation -> LeNet
  NeoCognitron -> LeNet
}

bibliographystyle{plain}
bibliography{sample1}
end{document}