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gujaf-61	doi.org	https://doi.org/10.1016/j.sbspro.2014.10.025
gujaf-61	doi.org	https://doi.org/10.1016/j.compind.2016.09.006
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gujaf-61	doi.org	https://doi.org/10.1016/j.ins.2014.01.015
gujaf-61	doi.org	https://doi.org/https://doi.org/10.1016/j.ijpe.2011.09.001
gujaf-61	doi.org	https://doi.org/10.1016/j.future.2017.02.014
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gujaf-61	doi.org	https://doi.org/10.1016/j.bushor.2017.05.010
gujaf-61	doi.org	https://doi.org/10.3926/jiem.1940
gujaf-61	doi.org	https://doi.org/10.1016/j.promfg.2018.03.156
gujaf-61	doi.org	https://doi.org/10.17261/pressacademia.2017.688
gujaf-61	doi.org	https://doi.org/https://doi.org/10.1016/j.scs.2020.102364
gujaf-61	doi.org	https://doi.org/10.1016/j.techfore.2017.11.005
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gujaf-61	doi.org	https://doi.org/10.1016/j.resconrec.2018.10.009
gujaf-61	doi.org	https://doi.org/https://doi.org/10.1016/j.cam.2019.112595
gujaf-61	doi.org	https://doi.org/10.1155/2016/3159805
gujaf-61	doi.org	https://doi.org/10.1016/j.ifacol.2016.12.168
gujaf-61	doi.org	https://doi.org/10.1007/9783-319-23681-0_2
gujaf-61	doi.org	https://doi.org/10.1007/s40171-018-0189-5
gujaf-61	doi.org	https://doi.org/10.1515/mper20160030
gujaf-61	doi.org	https://doi.org/10.1002/bse.1888