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Bernhard Oder; Maria Loewe; Michael Reisegger; Wilfried Lang; Wilfried Ilias; Siegfried A. Thurnher. (2008). CT-guided ozone/steroid therapy for the treatment of degenerative spinal disease—effect of age, gender, disc pathology and multi-segmental changes. , 50(9), 777–785. doi:10.1007/s00234-008-0398-2 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research