1. Digraphs
2. Bondy, J.A. and Murty, U.S.R. (2008) Graph Theory. Springer, Berlin.
3. Pendant tree-connectivity
4. Li, X., Mao, Y. and Sun, Y. (2014) On the Generalized (Edge-)Connectivity of Graphs. Australasian Journal of Combinatorics, 58, 304-319.
5. Generalized Connectivity of Graphs