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The author is U. G. C. Research Fellow at Andhra University, Waltair.
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Swamy, K.L.N. Dually Residuated Lattice Ordered Semigroups, III. Math. Ann. 167, 71–74 (1966). https://doi.org/10.1007/BF01361218
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DOI: https://doi.org/10.1007/BF01361218