Neogy, S KDas, A K2012-01-082012-01-082005Linear Algebra and its Applications, v.400, p.243-252http://hdl.handle.net/10263/2938enPrincipal pivot transformsAlmost copositive matrixAlmost fully copositive matrixSemi monotone matrixQo-matrixPrincipal pivot transforms of some classes of matricesArticle