“A NEW PRICING MODEL FOR CRUDE OIL PRE-SALE UNITS VIA SPF (STANDARD PARALLEL FORWARD) IN IRAN” (2018) Singaporean Journal of Business Economics and Management, 6((6), pp. 1–10. Available at: https://www.singaporeanjbem.com/index.php/SJBEM/article/view/426 (Accessed: 16 July 2026).