E-Learning Development Based on Internet of Things and Blockchain Technology during COVID-19 Pandemic[J] MATHEMATICS 2021(9) Rahmani, Amir Masoud Ali Naqvi, Rizwan Hussain Malik, Mazhar Malik, Tauqeer Safdar Sadrishojaei, Mahyar Hosseinzadeh, Mehdi Al-Musawi, Ali
