1. https://braintumor.org/brain-tumors/about-brain-tumors/brain-tumor-facts/
2. https://www.cancer.net/cancer-types/brain-tumor/statistics
3. https://timesofindia.indiatimes.com/life-style/health-fitness/health-news/doctor-lists-5-possible-causes-of-brain-tumour/photostory/100497382.cms?picid=100497407
4. Classification of brain tumors from MRI images using a convolutional neural network;Badza M.M.;Appl. Sci.,1999
5. https://www.kdnuggets.com/2021/01/sparse-features-machine-learning-html#:~:text=Sparse%20features%20are%20common%20in feature%20importances%2C%20and%20high%20variance