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"Bull-Reducible Berge Graphs are Perfect."
Hazel Everett et al. (2001)
- Hazel Everett, Celina M. H. de Figueiredo, Sulamita Klein, Bruce A. Reed:
Bull-Reducible Berge Graphs are Perfect. Electron. Notes Discret. Math. 10: 93-95 (2001)
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