Jose A. Tenreiro Machado is a Professor at the Institute of Engineering, Polytechnic of Porto, Portugal; Necati Ãzdemir is a Professor with the Department of Mathematics, BalÄąkesir University, BalÄąkesir, Turkey; Dumitru Baleanu is a Professor with the Department of Mathematics, Ãankaya University, Ankara, Turkey and the Institute of Space Sciences, Magurele-Bucharest, Romania.