What, then, do we make of the substantial and growing literature on informal carers?

There is a substantial literature based on his writings.

A substantial literature existed concerning them, going back to the 17th century, but their religious outlook and rituals were poorly understood.

This has prompted substantial critical literature, including 3 international conferences.

Over the past two decades a substantial literature on the evaluation of educational activities have emerged.

Another substantial literature, recently surveyed by Craghill, relates to public library use.

The more general relationship between higher education and the economy is of course extremely complex, but here also there is a substantial literature.

Postmodern philosophy has strong relations with the substantial literature of critical theory.

The site has been studied for over 120 years and is the subject of a substantial literature.

They are legitimate fields of study and interest, each with a substantial literature, but their 'promotion' causes dismay in many quarters already.