There are two sets of instance types associated with the Cirasella instances.
Those (27 instances) that are designated Benchmark Instances at the following website http://www2.research.att.com/~dsj/chtsp/atsp.html and
those that may generated by using the generators which are also available at the aforementioned website.
Both sets of instances are provided here. The set of instances created with the ATSP generators include those used as part of the primary dataset (267 instances) and those used as part of the verification dataset (158 instances) in the paper by Srour and van de Velde (2011).
The appropriate citations for these instances are:
Cirasella J, Johnson D S, McGeoch L A, Zhang W. The asymmetric traveling salesman problem: algorithms, instance generators and tests. In: ALENEX ’01: revised papers from the third international workshop on algorithm engineering and experimentation London,UK:Springer-Verlag; 2001. p.32–59. ISBN3-540-42560-8.
D.S. Johnson, G. Gutin, L.A. McGeoch, A. Yeo, W. Zhang, and A. Zverovich, ``Experimental Analysis of Heuristics for the ATSP,'' in The Traveling Salesman Problem and Its Variations , G. Gutin and A. Punnen, editors, Kluwer Academic Publishers, Boston, 2002, 445-487.
Both papers may be found at: http://www2.research.att.com/~dsj/chtsp/atsp.html
Note, these instances are in TSP LIB format -- the COMMENT field in the heading section reflects the problem type as denoted in Srour and van de Velde (2011); greater detail on these problems may be found in Cirasella, et al (2001) and Johnson (2002), as noted above.