Neither the time-scale of the contract nor the range of languages in which materials are published, permitted inspection of many of the items cited. Those cited appear from the information available to be relevant to the enquiry. It is hoped that the bibliographic detail provided will enable users to follow up references and where a source would appear to be particularly worthy of further exploration, this has been highlighted. It would be advisable to regard this report as the foundation of a resource which should be regularly reviewed and updated. Within each section the references are given in alphabetical order.
References are, where appropriate, accompanied by comments.
Where a comment is preceded by the word 'abstract' then that comment is the abstract as written by the author or the editor of the text. Other comments have their source identified at the end.