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“Entertainment Cost Efficiency Analysis With Data Envelopment Analysis (Dea) And Fuzzy Logic (Flp & C-Iowa) Approach To Sales Level: Analisa Efisiensi Biaya Entertainment Dengan Pendekatan Data Envelopment Analysis (Dea) Dan Fuzzy Logic (Flp & C-Iowa) Terhadap Tingkat Penjualan”, PELS, vol. 1, no. 1, Mar. 2021, doi: 10.21070/pels.v1i1.853.