1. Department of Mathematical SciencesIndian Institute of Technology (BHU)Varanasi 221005 India
2. Faculty of Mechanical EngineeringOtto von Guericke University Magdeburg39106 Magdeburg Germany
3. Faculty of Mechanical, Industrial and Maritime EngineeringOvidius University of ConstantaBd. Mamaia 124 900527 Constanta Romania