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To E. S. Golod on his fiftieth birthday
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Avramov, L., Halperin, S. On the non-vanishing of cotangent cohomology. Commentarii Mathematici Helvetici 62, 169–184 (1987). https://doi.org/10.1007/BF02564444
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DOI: https://doi.org/10.1007/BF02564444