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Erdal Karapιnar
Department of Mathematics, Atilim University, 06836, İncek,Ankara, Turkey
Antonio-Francisco Roldán-López-de-Hierro
Department of Quantitative Methods for Economics and Business, Faculty of Economic and Business Sciences, University of Granada, Campus Universitario de La Cartuja, 18011,Granada, Spain
Bessem Samet
Department of Mathematics, King Saud University,Riyadh, Saudi Arabia