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Agard, C; Carpentier, PH; Mouthon, L; Clerson, P; Gressin, V; Bérezné, A; Diot, E; Jego, P; Lok, C; Sparsa, A; Chatelus, E; Van Kien, A Khau; Quéré, I; Sibilia, J; Hachulla, E . (2014). Use of bosentan for digital ulcers related to systemic sclerosis: a real-life retrospective French study of 89 patients treated since specific approval. Scandinavian Journal of Rheumatology, 43(5), 398–402. doi:10.3109/03009742.2014.887768 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research