"History of string theory#1994\u20132003: second superstring revolution" . "superstring theory" . . "History of string theory" . . "History of string theory#1984\u20131989:_first_superstring_revolution" . "Finite Energy Sum Rules" . "History of string theory#1994\u20132000:_second_superstring_revolution" . "Sommerfeld\u2013Watson representation" . . . . "History of string theory#1984\u20131994: first superstring revolution" . "History of string theory" . . . "second superstring revolution" . "history of string theory" .