The following publications are possibly variants of this publication:
- Reachability Relations and the Structure of Transitive DigraphsNorbert Seifter, Vladimir Ivanovich Trofimov. combinatorics, 16(1), 2009. [doi]
- Highly arc transitive digraphs: reachability, topological groupsAleksander Malnic, Dragan Marusic, Rögnvaldur G. Möller, Norbert Seifter, Vladimir Ivanovich Trofimov, Boris Zgrablic. ejc, 26(1):19-28, 2005. [doi]
- Reachability relations in digraphsAleksander Malnic, Dragan Marusic, Norbert Seifter, Primoz Sparl, Boris Zgrablic. ejc, 29(7):1566-1581, 2008. [doi]