Frederick Hoffman,Southeastern Conference on Combinatorics, Graph Theory and Computing.Southeastern Conference on Combinatorics, Graph Theory and Computing (14th : 1983 : Florida Atlantic University)：Congressus numerantium．V.40.Utilitas Mathematica Pub. Incoroporated,1983.
F. Hoffman,Southeastern Conference on Combinatorics, Graph Theory and Computing.Southeastern Conference on Combinatorics, Graph Theory and Computing(14th : 1983 : Florida Atlantic University)：Congressus numerantium．V.40.Utiitas Mathematica Pub. incorporated,1983.
