1. What is on his mind?;Barát;Discr. Math.,2010
2. On a problem of graph theory;Erdős;Studia Sci. Math. Hungar.,1966
3. Graphes 4-essentiels;Fontet;C. R. Acad. Sci. Paris,1978
4. S. Fujita K. Kawarabayashi Non-separating even cycles in highly connected graphs