References
- Biggs , N. L. 1974 . Algebraic Graph Theory , London : Cambridge University Press .
- Dündar , P. 1989 . J. Faculty of Science Ege University, Series A, , 12 : 61 – 67 .
- Lipschutz , S. 1991 . Theory and Problems of Linear Algebra, , 2nd edn , London : Schaum's Outline Series .