1. J. Akiyama, T. Hamada, and I. Yoshimura. On characterizations of the middle graph. TRU Mathematics, 11:35–39, 1975.
2. M. O. Albertson and K. L. Collins. Duality and perfection for edges in cliques. Journal of Combinatorial Theory B, 36:298–309, 1984.
3. R. Balakrishnan and P. Paulraja. Self-clique graphs and diameters of iterated clique graphs. Utilitas Mathematica, 29:263–268, 1986.
4. E. Balas and C. S. Yu. On graphs with polynomially solvable maximum-weight clique problem. Networks, 19:247–253, 1989.
5. H.-J. Bandelt and E. Prisner. Clique graphs and Helly graphs. Journal of Combinatorial Theory B, 51:34–45, 1991.