Lower bounds for the clique and the chromatic numbers of a graph. - C. S. Edwards; C. H. Elphick (Discret. Appl. Math., 1983)

New spectral bounds on the chromatic number combining eigenvalues of the Laplacian and signless Laplacian - Clive Elphick; Pawel Wocjan (CoRR, 2012)

New Spectral Bounds on the Chromatic Number Encompassing all Eigenvalues of the Adjacency Matrix. - Pawel Wocjan; Clive Elphick (Electron. J. Comb., 2013)

Strengthening Turan's Theorem for Irregular Graphs - Clive Elphick; Pawel Wocjan (CoRR, 2013)

New measures of graph irregularity. - Clive Elphick; Pawel Wocjan (Electron. J. Graph Theory Appl., 2014)

Unified spectral bounds on the chromatic number. - Clive Elphick; Pawel Wocjan (Discuss. Math. Graph Theory, 2015)

Errata: New measures of graph irregularity. - Clive Elphick; Pawel Wocjan (Electron. J. Graph Theory Appl., 2015)

Conjectured bounds for the sum of squares of positive eigenvalues of a graph. - Clive Elphick; Miriam Farber; Felix Goldberg; Pawel Wocjan (Discret. Math., 2016)

An Inertial Lower Bound for the Chromatic Number of a Graph. - Clive Elphick; Pawel Wocjan (Electron. J. Comb., 2017)

Upper bounds for the achromatic and coloring numbers of a graph. - Baoyindureng Wu; Clive Elphick (Discret. Appl. Math., 2017)

Spectral Lower Bounds for the Orthogonal and Projective Ranks of a Graph. - Pawel Wocjan; Clive Elphick (Electron. J. Comb., 2019)

Spectral lower bounds for the quantum chromatic number of a graph. - Clive Elphick; Pawel Wocjan (J. Comb. Theory A, 2019)

Spectral Lower Bounds for the Quantum Chromatic Number of a Graph - Part II. - Pawel Wocjan; Clive Elphick; Parisa Darbari (Electron. J. Comb., 2020)

More tales of Hoffman: bounds for the vector chromatic number of a graph. - Pawel Wocjan; Clive Elphick; David Anekstein (Discuss. Math. Graph Theory, 2023)