Reference
Lancaster, F.W.,The Measurement and Evaluation of Library Services, (Washington, D.C.: Information Resources, 1977), P. 330.
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Diodato, V.P. Semigroup literature. Semigroup Forum 20, 187–188 (1980). https://doi.org/10.1007/BF02572680
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DOI: https://doi.org/10.1007/BF02572680