Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=tsyb20 International Journal of Systems Science: Operations & Logistics ISSN: (Print) (Online) Journal homepage: https://www.tandfonline.com/loi/tsyb20 An EPQ model with time proportion deterioration and ramp type demand under different payment schemes with fuzzy uncertainties Puja Supakar & Sanat Kumar Mahato To cite this article: Puja Supakar & Sanat Kumar Mahato (2020): An EPQ model with time proportion deterioration and ramp type demand under different payment schemes with fuzzy uncertainties, International Journal of Systems Science: Operations & Logistics, DOI: 10.1080/23302674.2020.1826594 To link to this article: https://doi.org/10.1080/23302674.2020.1826594 View supplementary material Published online: 03 Oct 2020. Submit your article to this journal View related articles View Crossmark data