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This article was written by the authors with a during the forth author's visit to Milano and, independently.
This article was written by the authors with during the second author's visit to Trento. The second and forth authors would like to thank the departments of Mathematics in Trento and Milano (respectively) for their hospitality and support. The fifth author's work has been partially supported by CNR-GNASAGA and MPI funds.
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Bianchi, M., Chillag, D., Mauri, A.G.B. et al. Applications of a graph related to conjugacy classes in finite groups. Arch. Math 58, 126–132 (1992). https://doi.org/10.1007/BF01191876
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DOI: https://doi.org/10.1007/BF01191876