Origins of Answer-Set Programming - Some Background And Two Personal   Accounts
  We discuss the evolution of aspects of nonmonotonic reasoning towards the computational paradigm of answer-set programming (ASP). We give a general overview of the roots of ASP and follow up with the personal perspective on research developments that helped verbalize the main principles of ASP and differentiated it from the classical logic programming. 
Victor W. Marek, Ilkka Niemela and Miroslaw Truszczynski
cs.AI