COMPARING TWO IMPROVED TECHNIQUES WITH THE TRADITIONAL SURGICAL TECHNIQUES FOR INTRA AND EXTRAMEDULLARY SPINAL TUMOR RESECTION: A REPORT OF 280 CASES СтатьяDjumanov K., Kariev G., Chmutin G., Antonov G., Chmutin E., Musa G., Maier A., Shumadalova A.Frontiers in Surgery. Том 9. 2022.