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. 2022 May 19;29(46):70285–70304. doi: 10.1007/s11356-022-20713-0
xii Equal 1, if supplier i is established; else 0,
xmm Equal 1, if manufacture m is established; else 0,
xdd Equal 1, if DC d is established; else 0,
xuu Equal 1, if collection centers u is established; else 0,
xkk Equal 1, if repairing centers k is established; else 0,
xee Equal 1, if disposal centers e is established; else 0,