All documents cited in the search report are identified by placing a particular letter in the first column of the citation sheets. Where needed, combinations of different categories are possible. The following letters are used.

9.2.1 Particularly relevant documents

9.2.2 Documents defining the state of the art and not prejudicing novelty or inventive step

9.2.3 Documents which refer to a non-written disclosure

9.2.4 Intermediate documents

9.2.5 Documents relating to the theory or principle underlying the invention

9.2.6 Potentially conflicting patent documents

9.2.7 Documents cited in the application

9.2.8 Documents cited for other reasons