Thepade, Sudeep D. et al. «Covid19 Identification from Chest X-ray Images using Machine Learning Classifiers with GLCM Features». ELCVIA: electronic letters on computer vision and image analysis, 2020, vol.VOL 19, núm. 3, p. 85-97, http://raco.cat/index.php/ELCVIA/article/view/375822.