1. 1. Association for Motor Disabilities an multiple sclerosis, Bulgarian Association of Neurologists. [National consensus for diagnosing and treatment of multiple sclerosis]. Milonov I, editor, 2021. Bulgarian.
2. 2. Drenska K. [Multiple Sclerosis and Comorbidity – Impact on the Quality of Life] [Dissertation]. Varna: Medical University-Varna; 2016. Bulgarian.
3. 3. Trenova A. [Multiple Sclerosis – Genetic, Immunological and Clinico-neuropsychological Correlations] [Dissertation]. Plovdiv: Medical University-Plovdiv; 2018. Bulgarian.
4. 4. GBD 2016 Motor Neuron Disease Collaborators. Global, regional, and national burden of motor neuron diseases 1990-2016: a systematic analysis for the Global Burden of Disease Study 2016. Lancet Neurol. 2018;17(12):1083-97.
5. 5. Zlatareva E, Milanov I, Ivanova SH, Georgiev DP. Tumor-like lesions in a patient diagnosed with multiple sclerosis as non-onset manifestation of the disease. Mov disor. 2020;17(1):47-52.