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This work is partially subvened by Marathwada University Research Grant No. 12.
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Ajgaonkar, S.G.P. A contribution to the theory of unique estimators for Horvitz and Thompson’s classes of linear estimators. Metrika 15, 40–47 (1970). https://doi.org/10.1007/BF02613555
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DOI: https://doi.org/10.1007/BF02613555