A literature reference Definition to include references for example for detectors, manuals, instruments, acquisition or analysis software used. The idea would be to include this in the relevant NeXus object: :ref:`NXdetector` for detectors, :ref:`NXinstrument` for instruments, etc. This should describe the reason for including this reference. For example: The dataset in this group was normalised using the method which is described in detail in this reference. URL referencing the document or data. DOI referencing the document or data. Bibliographic reference data in EndNote format. Bibliographic reference data in BibTeX format.