https://www.wolframalpha.com/input/?i=distance-regular+graphs
distance-regular graphs - Wolfram|Alpha
distance regular graphswolframalpha
https://arxiv.org/abs/2411.00250
[2411.00250] Minimum number of distinct eigenvalues of distance-regular and signed Johnson graphs
Abstract page for arXiv paper 2411.00250: Minimum number of distinct eigenvalues of distance-regular and signed Johnson graphs