In memory of Professor Panayiotis D. Siafarikas
September 3 – 7, 2012,
Patras, Greece.
Evangelos Ifantis (Department of Mathematics, University of Patras, Greece)
Chrysoula G. Kokologiannaki (Department of Mathematics, University of Patras, Greece)
Eugenia N. Petropoulou (Department of Engineering Sciences, University of Patras, Greece)