References
- Dorcian , P. 1974 . On the connectivity of social networks . Journal of Mathematical Sociology , 3 : 245 – 258 .
- Harary , R. , Norman , R. and Cartwright , D. 1965 . Structural Models , New York : Wiley .
- School of Social Sciences, The Flinders University of South Australia, Bedford Park, South Australia, 5042.