Widiyana, Satya Swesty, and Rus Indiyanto. “Analisa Pengukuran Efisiensi Dengan Metode Data Envelopment Analysis (Dea) Di Heaven Store Surabaya Barat: Efficiency Measurement Analysis Using Data Envelopment Analysis (Dea) Method At Heaven Store West Surabaya”. PROZIMA (Productivity, Optimization and Manufacturing System Engineering), vol. 1, no. 1, June 2017, pp. 44-49, doi:10.21070/prozima.v1i1.705.