1. WHO. Archived: WHO Timeline - COVID-19, 2020. https://www.who.int/news-room/detail/27-04-2020-who-timeline---covid-19.
2. Imaging profile of the COVID-19 infection: radiologic findings and literature review;Ng;Radiology: Cardiothoracic Imaging,2020
3. Interpreting a covid-19 test result;Watson;BMJ,2020
4. COVID-Classifier: An automated machine learning model to assist in the diagnosis of COVID-19 infection in chest x-ray images;Khuzani;medRxiv,2020
5. Rajpal S, Kumar N, Rajpal A. Cov-elm classifier: An extreme learning machine based identification of covid-19 using chest-ray images, 2020. arXiv preprint arXiv:200708637.