First-principle calculations of structural, electronic and magnetic investigations of Mn2RuGe1-xSnx quaternary Heusler alloys by Semari, F., Dahmane, Fethallah, Baki, N., Al-Douri, Yarub, Akbudak, Salih, Ugur, Gokay, Ugur, Sule, Bouhemadou, Abdelmadjid, Khenata, Rabah, Voon, Chun Hong