The paper “An Admissible Role Similarity Measure for Labeled Directed Graphs” by Thuy Thi Thanh Phan, Norihide Matsubara, and Professor Akihiro Yamamoto was published in the journal Journal of Information Processing
Paper Link
Phan, T. T. T., Matsubara, N., & Yamamoto, A. (2025). An Admissible Role Similarity Measure for Labeled Directed Graphs. Journal of Information Processing, 33, 429-444. link