Media type: E-Article Title: Cospectral Graphs and Regular Orthogonal Matrices of Level 2 Contributor: Hamers, Herbert; Abiad, Aida imprint: Elsevier BV, 2012 Published in: SSRN Electronic Journal Language: English DOI: 10.2139/ssrn.2065864 ISSN: 1556-5068 Keywords: Pharmacology (medical) Origination: Footnote: