5Inventory of kinds of patent documents listed according to the issuing industrial property office [EB/OL]. http:// www. wipo. int/standards/en/part_07, html#7,2,2016.
6Survey of numbering systems used, or intended to be used, by industrial property offices with regard to applications, published documents and registered rlghts[Eg/OL].http://. wipo. int/standards/en/part_07, html#7,2,2001.
7Numbering systems and date formats introduced or planned to be applied with regard to the arrival of the year 2000[EB/ OL]. bttp://www, wipo. int/standards/en/part-07, btml#7,2, 2000.