Willem H. Haemers

Publication Activity (10 Years)

Years Active: 1979-2024
Publications (10 Years): 15

Top Topics

Spectral Decomposition

Candidate Pairs

Maximum Cardinality

Top Venues

Des. Codes Cryptogr.

Discret. Appl. Math.

Ars Math. Contemp.

Publications

Willem H. Haemers, Hatice Topcu
The signed graphs with two eigenvalues unequal to ±1. Appl. Math. Comput. 463 (2024)
Willem H. Haemers, Leila Parsaei Majd
Spectral symmetry in conference matrices. Des. Codes Cryptogr. 90 (9) (2022)
Saieed Akbari, Willem H. Haemers, Mohammad Ali Hosseinzadeh, Vladislav V. Kabanov, Elena V. Konstantinova, Leonid Shalaginov
Spectra of strongly Deza graphs. Discret. Math. 344 (12) (2021)
Sebastian M. Cioaba, Krystal Guo, Willem H. Haemers
The chromatic index of strongly regular graphs. Ars Math. Contemp. 20 (1) (2021)
Ebrahim Ghorbani, Willem H. Haemers, Hamid Reza Maimani, Leila Parsaei Majd
On sign-symmetric signed graphs. Ars Math. Contemp. 19 (1) (2020)
Willem H. Haemers
Cospectral pairs of regular graphs with different connectivity. Discuss. Math. Graph Theory 40 (2) (2020)
Omid Etesami, Willem H. Haemers
On NP-hard graph properties characterized by the spectrum. Discret. Appl. Math. 285 (2020)
Willem H. Haemers
Spectral characterization of mixed extensions of small graphs. Discret. Math. 342 (10) (2019)
Willem H. Haemers, Sezer Sorgun, Hatice Topcu
. Electron. J. Comb. 26 (3) (2019)
Hatice Topcu, Sezer Sorgun, Willem H. Haemers
The graphs cospectral with the pineapple graph. Discret. Appl. Math. 269 (2019)
Aida Abiad, Steve Butler, Willem H. Haemers
Graph switching, 2-ranks, and graphical Hadamard matrices. Discret. Math. 342 (10) (2019)
Aart Blokhuis, Edwin R. van Dam, Willem H. Haemers, Jack H. Koolen
Preface to the special issue dedicated to Andries E. Brouwer. Des. Codes Cryptogr. 84 (1-2) (2017)
Sebastian M. Cioaba, Willem H. Haemers, Jason R. Vermette
The graphs with all but two eigenvalues equal to -2 or 0. Des. Codes Cryptogr. 84 (1-2) (2017)
Aida Abiad, Willem H. Haemers
Switched symplectic graphs and their 2-ranks. Des. Codes Cryptogr. 81 (1) (2016)
Zoltán Blázsik, Jay Cummings, Willem H. Haemers
Cospectral regular graphs with and without a perfect matching. Discret. Math. 338 (3) (2015)
Marc Cámara, Willem H. Haemers
Spectral characterizations of almost complete graphs. Discret. Appl. Math. 176 (2014)
Dean Crnkovic, Willem H. Haemers
Walk-regular divisible design graphs. Des. Codes Cryptogr. 72 (1) (2014)
Edwin R. van Dam, Willem H. Haemers, Jack H. Koolen
Regular graphs with maximal energy per vertex. J. Comb. Theory, Ser. B 107 (2014)
Aida Abiad, Willem H. Haemers
Cospectral Graphs and Regular Orthogonal Matrices of Level 2. Electron. J. Comb. 19 (3) (2012)
Edwin R. van Dam, Willem H. Haemers
Preface: Geometric and algebraic combinatorics. Des. Codes Cryptogr. 65 (1-2) (2012)
Aart Blokhuis, Andries E. Brouwer, Willem H. Haemers
The graph with spectrum 141 240 (-4)10 (-6)9. Des. Codes Cryptogr. 65 (1-2) (2012)
Willem H. Haemers, M. J. P. Peeters
The maximum order of adjacency matrices of graphs with a given rank. Des. Codes Cryptogr. 65 (3) (2012)
Willem H. Haemers, Hadi Kharaghani, Maaike A. Meulenberg
Divisible design graphs. J. Comb. Theory, Ser. A 118 (3) (2011)
Edwin R. van Dam, Willem H. Haemers
An odd characterization of the generalized odd graphs. J. Comb. Theory, Ser. B 101 (6) (2011)
Edwin R. van Dam, Willem H. Haemers
Preface: Geometric and Algebraic Combinatorics. Eur. J. Comb. 31 (6) (2010)
Willem H. Haemers, Qing Xiang
) exist for all m>1. Eur. J. Comb. 31 (6) (2010)
Edwin R. van Dam, Willem H. Haemers
Developments on spectral characterizations of graphs. Discret. Math. 309 (3) (2009)
Sebastian M. Cioaba, David A. Gregory, Willem H. Haemers
Matchings in regular graphs from eigenvalues. J. Comb. Theory, Ser. B 99 (2) (2009)
Edwin R. van Dam, Willem H. Haemers
Geometric and algebraic combinatorics. Eur. J. Comb. 28 (7) (2007)
Aart Blokhuis, Andries E. Brouwer, Willem H. Haemers
On 3-chromatic distance-regular graphs. Des. Codes Cryptogr. 44 (1-3) (2007)
Nick C. Fiala, Willem H. Haemers
5-chromatic strongly regular graphs. Discret. Math. 306 (23) (2006)
Andries E. Brouwer, Peter J. Cameron, Willem H. Haemers, Donald A. Preece
Self-dual, not self-polar. Discret. Math. 306 (23) (2006)
Edwin R. van Dam, Willem H. Haemers, Jacobus H. Koolen, Edward Spence
Characterizing distance-regularity of graphs by the spectrum. J. Comb. Theory, Ser. A 113 (8) (2006)
Aart Blokhuis, Willem H. Haemers
Preface. Des. Codes Cryptogr. 34 (2-3) (2005)
Willem H. Haemers, Edward Spence
Enumeration of cospectral graphs. Eur. J. Comb. 25 (2) (2004)
Eiichi Bannai, Willem H. Haemers, Patrick Solé
Johan Jacob Seidel 1919-2001. Eur. J. Comb. 25 (2) (2004)
Willem H. Haemers, Edward Spence
). Eur. J. Comb. 22 (6) (2001)
Willem H. Haemers
Bicliques and Eigenvalues. J. Comb. Theory, Ser. B 82 (1) (2001)
Frans C. Bussemaker, Willem H. Haemers, Edward Spence
The Search for Pseudo Orthogonal Latin Squares of Order Six. Des. Codes Cryptogr. 21 (1/3) (2000)
Aart Blokhuis, Willem H. Haemers
Preface. Des. Codes Cryptogr. 21 (1/3) (2000)
Willem H. Haemers, René Peeters, Jeroen M. van Rijckevorsel
Binary Codes of Strongly Regular Graphs. Des. Codes Cryptogr. 17 (1-3) (1999)
Willem H. Haemers
Minimum resolvable coverings with small parallel classes. Discret. Math. (1999)
Edwin R. van Dam, Willem H. Haemers
Graphs with constant µ and µ_. Discret. Math. 182 (1-3) (1998)
Willem H. Haemers
Disconnected Vertex Sets and Equidistant Code Pairs. Electron. J. Comb. 4 (1) (1997)
Willem H. Haemers, Vladimir D. Tonchev
Spreads in Strongly Regular Graphs. Des. Codes Cryptogr. 8 (1-2) (1996)
Matthijs J. Coster, Willem H. Haemers
Quasi-Symmetric Designs Related to the Triangular Graph. Des. Codes Cryptogr. 5 (1) (1995)
Willem H. Haemers, Christopher Parker, Vera Pless, Vladimir D. Tonchev
. J. Comb. Theory, Ser. A 62 (2) (1993)
Andries E. Brouwer, Willem H. Haemers
The Gewirtz Graph: An Exercise in the Theory of Graph Spectra. Eur. J. Comb. 14 (5) (1993)
Andries E. Brouwer, Willem H. Haemers
Structure and uniqueness of the (81, 20, 1, 6) strongly regular graph. Discret. Math. (1992)
Andries E. Brouwer, Henny A. Wilbrink, Willem H. Haemers
Some 2-ranks. Discret. Math. (1992)
Willem H. Haemers
Regular 2-Graphs and Extensions of Partial Geometries. Eur. J. Comb. 12 (2) (1991)
Willem H. Haemers
= 1. J. Comb. Theory, Ser. A 57 (2) (1991)
Frans C. Bussemaker, Willem H. Haemers, J. J. Seidel, Edward Spence
, lambda) graphs and designs with trivial automorphism group. J. Comb. Theory, Ser. A 50 (1) (1989)
Frans C. Bussemaker, Willem H. Haemers, R. Matron, Henny A. Wilbrink
A (49, 16, 3, 6) Strongly Regular Graph Does Not Exist. Eur. J. Comb. 10 (5) (1989)
Willem H. Haemers
Access Control at the Netherlands Postal and Telecommunications Services. CRYPTO (1985)
B. Sanders, Willem H. Haemers, R. Wilcke
A Contribution to the Techniques of Traffic Engineering in Communications Networks With Waiting Facilities. ICC (1) (1984)
Willem H. Haemers
On Some Problems of Lovász Concerning the Shannon Capacity of a Graph. IEEE Trans. Inf. Theory 25 (2) (1979)