@ARTICLE{
author={Cvetkovic Dragos M,Haemers W,Rowlinson Peter},
year={2007},
title={Special issue devoted to papers presented at the Aveiro Workshop on graph spectra - Preface},
journal={LINEAR ALGEBRA AND ITS APPLICATIONS},
volume={423},
number={1},
pages={1-2},
document_type={Editorial Material},
} 

@ARTICLE{
author={Cvetkovic Dragos M,Haemers W,Rowlinson Peter},
year={2002},
title={Special issue on algebraic graph theory - Preface},
journal={LINEAR ALGEBRA AND ITS APPLICATIONS},
volume={356},
number={},
pages={1-2},
document_type={Editorial Material},
}