• Linear Groups Associated with elements of a Group Algebra (em colaboração com J.A.Dias da Silva), Linear Algebra and its Applications 94:165-179,1987
• On linear preservers of immanants, Linear Algebra and its Applications 247:265-271, 1996
• On the conversion of an immanant into another (em colaboração com M.Antónia Duffner), Linear and Multilinear Algebra 44:111-130, 1998
• Immanant preserving and immanant converting maps (em colaboração com M.Antónia Duffner), Linear Algebra and its Applications 418:177-187, 2006
• Linear preservers of immanants on skew-symmetric matrices (em colaboração com M.Antónia Duffner), Linear Algebra and its Applications 436: 2536-2553, 2012

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