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Budiman, Irwan; Sembiring, Anita Christine; Tampubolon, Jusra; Wahyuni, Dini; Dharmala, Andrew . (2019). Improving effectiveness and efficiency of assembly line with a stopwatch time study and balancing activity elements. Journal of Physics: Conference Series, 1230(), 012041–. doi:10.1088/1742-6596/1230/1/012041 
10.1088/1742-6596/1230/1/012041