Cioabă, Sebastian M.; Koolen, Jack H.; Mimura, Masato; Nozaki, Hiroshi; Okuda, Takayuki On the spectrum and linear programming bound for hypergraphs. (English) Zbl 1490.05193 Eur. J. Comb. 104, Article ID 103535, 22 p. (2022). MSC: 05C65 05C48 90C05 PDFBibTeX XMLCite \textit{S. M. Cioabă} et al., Eur. J. Comb. 104, Article ID 103535, 22 p. (2022; Zbl 1490.05193) Full Text: DOI arXiv
Cioabă, S. M.; Koolen, J. H.; Terwilliger, P. Connectivity concerning the last two subconstituents of a \(Q\)-polynomial distance-regular graph. (English) Zbl 1448.05061 J. Comb. Theory, Ser. A 177, Article ID 105325, 6 p. (2021). MSC: 05C12 05C40 05E30 PDFBibTeX XMLCite \textit{S. M. Cioabă} et al., J. Comb. Theory, Ser. A 177, Article ID 105325, 6 p. (2021; Zbl 1448.05061) Full Text: DOI arXiv
Qiao, Zhi; Park, Jongyook; Koolen, Jack H. On 2-walk-regular graphs with a large intersection number \(c_2\). (English) Zbl 1416.05161 Eur. J. Comb. 80, 224-235 (2019). MSC: 05C40 05C12 PDFBibTeX XMLCite \textit{Z. Qiao} et al., Eur. J. Comb. 80, 224--235 (2019; Zbl 1416.05161) Full Text: DOI
Bang, Sejeong; Koolen, J. H. On geometric distance-regular graphs with diameter three. (English) Zbl 1284.05077 Eur. J. Comb. 36, 331-341 (2014). MSC: 05C12 PDFBibTeX XMLCite \textit{S. Bang} and \textit{J. H. Koolen}, Eur. J. Comb. 36, 331--341 (2014; Zbl 1284.05077) Full Text: DOI
Koolen, Jack H.; Park, Jongyook A note on distance-regular graphs with a small number of vertices compared to the valency. (English) Zbl 1285.05045 Eur. J. Comb. 34, No. 6, 935-940 (2013). MSC: 05C12 PDFBibTeX XMLCite \textit{J. H. Koolen} and \textit{J. Park}, Eur. J. Comb. 34, No. 6, 935--940 (2013; Zbl 1285.05045) Full Text: DOI
Koolen, Jack H.; Park, Jongyook A relationship between the diameter and the intersection number \(c _{2}\) for a distance-regular graph. (English) Zbl 1245.05037 Des. Codes Cryptography 65, No. 1-2, 55-63 (2012). MSC: 05C12 05E30 05C65 PDFBibTeX XMLCite \textit{J. H. Koolen} and \textit{J. Park}, Des. Codes Cryptography 65, No. 1--2, 55--63 (2012; Zbl 1245.05037) Full Text: DOI arXiv
Cioabă, Sebastian M.; van Dam, Edwin R.; Koolen, Jack H.; Lee, Jae-Ho A lower bound for the spectral radius of graphs with fixed diameter. (English) Zbl 1217.05139 Eur. J. Comb. 31, No. 6, 1560-1566 (2010). MSC: 05C50 05C35 05C12 PDFBibTeX XMLCite \textit{S. M. Cioabă} et al., Eur. J. Comb. 31, No. 6, 1560--1566 (2010; Zbl 1217.05139) Full Text: DOI Link
Cioabă, Sebastian M.; van Dam, Edwin R.; Koolen, Jack H.; Lee, Jae-Ho Asymptotic results on the spectral radius and the diameter of graphs. (English) Zbl 1209.05140 Linear Algebra Appl. 432, No. 2-3, 722-737 (2010). Reviewer: Dragan Stevanović (Niš) MSC: 05C50 05C12 PDFBibTeX XMLCite \textit{S. M. Cioabă} et al., Linear Algebra Appl. 432, No. 2--3, 722--737 (2010; Zbl 1209.05140) Full Text: DOI Link
van Dam, E. R.; Koolen, J. H. A new family of distance-regular graphs with unbounded diameter. (English) Zbl 1074.05092 Invent. Math. 162, No. 1, 189-193 (2005). MSC: 05E30 PDFBibTeX XMLCite \textit{E. R. van Dam} and \textit{J. H. Koolen}, Invent. Math. 162, No. 1, 189--193 (2005; Zbl 1074.05092) Full Text: DOI Link
Hiraki, Akira; Koolen, Jack An improvement of the Godsil bound. (English) Zbl 1009.05138 Ann. Comb. 6, No. 1, 33-44 (2002). MSC: 05E30 PDFBibTeX XMLCite \textit{A. Hiraki} and \textit{J. Koolen}, Ann. Comb. 6, No. 1, 33--44 (2002; Zbl 1009.05138) Full Text: DOI
Hiraki, Akira; Koolen, Jack An improvement of the Ivanov bound. (English) Zbl 0929.05092 Ann. Comb. 2, No. 2, 131-135 (1998). MSC: 05E30 PDFBibTeX XMLCite \textit{A. Hiraki} and \textit{J. Koolen}, Ann. Comb. 2, No. 2, 131--135 (1998; Zbl 0929.05092) Full Text: DOI
Koolen, Jacobus Hendricus Euclidean representations and substructures of distance-regular graphs. (English) Zbl 0812.05073 Helmond: Wibro Dissertatiedrukkerij. x, 122 p. (1994). Reviewer: G.Schaar (Freiberg) MSC: 05E30 05C12 PDFBibTeX XMLCite \textit{J. H. Koolen}, Euclidean representations and substructures of distance-regular graphs. Helmond: Wibro Dissertatiedrukkerij (1994; Zbl 0812.05073)
Koolen, J. H. On uniformly geodetic graphs. (English) Zbl 0787.05061 Graphs Comb. 9, No. 4, 325-333 (1993). MSC: 05C38 05C12 05C75 PDFBibTeX XMLCite \textit{J. H. Koolen}, Graphs Comb. 9, No. 4, 325--333 (1993; Zbl 0787.05061) Full Text: DOI