Minimal k-saturated and color critical graphs of prescribed minimum degree

[1]  Alan J. Hoffman,et al.  On Moore Graphs with Diameters 2 and 3 , 1960, IBM J. Res. Dev..

[2]  Paul Erdös,et al.  On a Problem in Graph Theory , 1963, The Mathematical Gazette.

[3]  P. Turán On the theory of graphs , 1954 .