Ana Alves de Sá is an Assistant Professor at the NOVA School of Science and Technology, Portugal. She earned her Ph.D. in Mathematics (1994) from NOVA University Lisbon, with visiting periods at the Center for Mathematical Research of the Autonomous University of Barcelona, Spain. Her research interests lie in Differential Equations. Bento Louro is an Associate Professor (retired) at the NOVA School of Science and Technology, Portugal. His research focuses on mathematical analysis, with an emphasis on Partial Differential Equations.