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Physical Review Letters
The inorganic crystalline polymer polysulfur nitride has been found to become superconducting with a transition temperature of (0.26±0.03)°K. © 1975 The American Physical Society.
W.D. Gill, W. Bludau, et al.
Physical Review Letters
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Physica B+C
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Journal of the Chemical Society, Chemical Communications
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Physical Review Letters