b) References to other documents 

In T 869/91, the statement of grounds referred only generally to certain documents, but as the board could gather from further arguments in the statement what the appellant sought to assert on the basis of those documents, it was considered admissible.

Precisely cited passages from the relevant literature become an integral part of the grounds but cannot by themselves form a sufficient statement of grounds (T 1402/10, citing T 922/05).