References
- Zhan X. Matrix theory. Providence, RI: American Mathematical Society; 2013 (Graduate studies in mathematics; vol. 147).
- Wu H. On the 0–1 matrices whose squares are 0–1 matrices. Linear Algebra Appl. 2010;432:2909–2924. doi: 10.1016/j.laa.2009.12.033
- Huang Z, Zhan X. Digraphs that have at most one walk of a given length with the same endpoints. Discrete Math. 2011;311:70–79. doi: 10.1016/j.disc.2010.09.025
- Huang Z, Lyu Z, Qiao P. Turán problems for digraphs avoiding different walks of a given length with the same endpoints, arXiv:1608.06170.