Context: Jonassohn and Björnson postulate that the major reason why no single generally accepted genocide definition has emerged is because academics have adjusted their focus to emphasise different periods and have found it expedient to use slightly different definitions to help them interpret events. For example, Frank Chalk and Kurt Jonassohn studied the whole of human history, while Leo Kuper and R. J. Rummel in their more recent works concentrated on the 20th century, and Helen Fein, Barbara Harff and Ted Gurr have looked at post World War II events. Jonassohn and Björnson are critical of some of these studies, arguing that they are too expansive, and conclude that the academic discipline of genocide studies is too young to have a canon of work on which to build an academic paradigm.

Question: What two writers examined the lack of an accepted and singular definition for genocide?
Answer: Jonassohn and Björnson

Question: The two writers suggested that academics adjusted what in their different definitions to assist them in interpreting events? 
Answer: their focus

Question: What writer joined Jonassohn in the study of the whole of human history?
Answer: Frank Chalk

Question: With whom was Leo Kuper paired in research that focused on 20th century works?
Answer: R. J. Rummel

Question: Two women and what man concentrated on post World War II events?
Answer: Ted Gurr

Question: What two writers examined the lack of an accepted and singular definition for academics?
Answer: Unanswerable

Question: The two writers suggested that academics adjusted what in their different definitions to assist them in interpreting paradigms?
Answer: Unanswerable

Question: What writer joined Jonassohn in the study of definitions?
Answer: Unanswerable

Question: With whom was Leo Kuper paired in research that focused on definitions?
Answer: Unanswerable

Question: Two women and what man concentrated on academic paradigms?
Answer: Unanswerable