4B [Scope of Convention (issues excluded): court ruled that applicability of seller's standard terms and conditions governed by gap-filling domestic law];

7C23 [Gap-filling by domestic law];

8A [Interpretation of party's statements or other conduct: intent of party making statement or engaging in conduct];

9C [Practices established by the parties];

18A3 [Criteria for acceptance of offer: silence or inactivity insufficient]