GENERAL RULES 1 AND 6 FOR THE INTERPRETATION OF THE COMBINED NOMENCLATURE.
CHAPTER 90, NOTE 1(f).
EU REGULATION 111/2011.
THE HARMONISED SYSTEM EXPLANATORY NOTES TO HEADING 9021, NOTE (III) (B) (4).
THE TEXT OF TARIC CODES 9021, 9021 29, 9021 29 00 AND 9021 29 00 00.