[see also: overview
For an extensive survey of......, see......
For a survey of what is known to date, see [G].
A survey of the research on fn(x,y) up to 2007 (most of it dealing with the case n=1) was given in .
The survey article  by Diestel contains a wealth of information about the Dunford--Pettis property.
We cannot survey this whole subject here.