Diagnosing COVID-19 pneumonia from x-ray and CT images using deep learning and transfer learning algorithms - Maghdid, Halgurd S; Asaad, Aras T; Ghafoor, Kayhan Zrar; Sadiq, Ali Safaa; Mirjalili, Seyedali; Khan, Muhammad Khurram (Multimodal Image Exploitation and Learning 2021, 2021)