 The problems that Kamp goes on to address are the treatment of donkey anaphora and simple discourse anaphora. Hence Kamp appears to be saying that these problems cannot be handled within more traditional frameworks and thus that a DRT approach is necessary. Obviously, the claim that the semantics of anaphora requires a radical revision in semantic theory got the attention of philosophers of language. Thus, the study of problematic anaphora blossomed during the 1980s and 1990s.