There are no reliable sources when it comes to international trade, technology data as most of these are kept secretive. USA maintains a complex web of technology trade. For example, South Korea, Taiwan did not even have a proper semiconductor R&D before 1990s and suddenly they are using the most advanced technology of foundries. But no source ever tells how USA is supplying them technology, there terms etc. No source tells how ASML obtains the critical EUV parts, who produces them, who funded the R&D of the EUV etc.
Can you give me a reliable source about the petrodollar agreement and the terms of the agreement? Remember this happened over 50 years back and everyone knows that GCC states have their currency pegged to USD & is even enforced in international trade. But not one source has mentioned the terms of the agreement.