"1945" . . "Mathématicien, Etats-Unis Robert M. Hardt" . "Hardt" . "M." . "Mathematician, United States Robert M. Hardt" . "Mathematiker, USA Robert M. Hardt" . "Hardt, Robert M. Mathématicien, Etats-Unis" . "Hardt, Robert M. Mathematiker, USA" . "Robert" . "Hardt, Robert M. Mathematician, United States" . . .