4.4 Irrelevant matter 

Since the skilled person is presumed to have the general technical background knowledge appropriate to the art, the examining division does not require the applicant to insert anything in the nature of a treatise or research report or explanatory matter obtainable from textbooks or otherwise well known. Likewise, the examining division does not require a detailed description of the content of cited prior documents. It is sufficient to indicate the reason for the inclusion of the reference unless, in a particular case, a more detailed description is necessary for a full understanding of the application's invention (see also F‑III, 8 and F‑IV, 2.3.1).

A list of several reference documents relating to the same feature or aspect of the prior art is not required; only the most appropriate need be specified. On the other hand, the examining division does not insist upon the excision of any such unnecessary matter, except when it is very extensive (see F‑II, 7.4).