1. Additivity of the genus of a graph
2. Biggs, N. L., Lloyd, E. K., Wilson, R. J. (1976). Graph Theory 1736–1936. Oxford: Clarendon Press. Revised editions 1986, 1998.
3. The coming of the matroids;Cunningham W. H.;Doc. Math,2012
4. Edmonds, D. (2020). The Murder of Professor Schlick: The Rise and Fall of the Vienna Circle. Princeton: Princeton Univ. Press.
5. Gillman, L. (1987). Writing Mathematics Well: A Manual for Authors. Washington D.C.: Math. Assoc. Amer.