Methods of digraph representation and cluster analysis for analyzing free association

@article{Miyamoto1990MethodsOD,
  title={Methods of digraph representation and cluster analysis for analyzing free association},
  author={Sadaaki Miyamoto and Shinsuke Suga and Ko Oi},
  journal={IEEE Trans. Systems, Man, and Cybernetics},
  year={1990},
  volume={20},
  pages={695-701}
}