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Trivedi, H.K.N., Rastogi, S.C. & Awasthi, G.D. On associative curves. I. Acta Mathematica Academiae Scientiarum Hungaricae 27, 55–61 (1976). https://doi.org/10.1007/BF01896756
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DOI: https://doi.org/10.1007/BF01896756