Ya-Lan Chan Sue-Ming Hsu Mei-Hua Liao An Inventory Model for Perishable Items Under Upstream and Downstream Trade Credit. 552-560 2020 IMIS https://doi.org/10.1007/978-3-030-50399-4_54 conf/imis/2020 db/conf/imis/imis2020.html#ChanHL20