1. On the complexity of deciding sense of direction;Boldi,1996
2. On some constructions which preserve sense of direction;Boldi,1997
3. Minimal sense of direction in regular networks;Flocchini;Inform. Process. Lett.,1997
4. Sense of direction: Formal definition and properties;Flocchini,1995
5. Complete symmetries and minimal sense of direction in labeled graphs;Flocchini,1996