Ather, Danish, Ashendra Kumar Saxena, and Ambuj Kumar Agarwal. 2014. “ A Simplified Solution To Design DFA That Accept Strings Over Input Symbol { A, B} Having At Least X Number Of A And Exactly X Number Of B”. MATRIX Academic International Online Journal Of Engineering And Technology 2 (2), 1-5. https://www.maiojet.com/index.php/matrix/article/view/16.