Econometrics as Pioneering in Nonexperimental Model Building Herman O. Wold Econometrica 1969 37(3), 369
The Identification Problem in Econometrics Herman O. Wold; Franklin M. Fisher Econometrica 1969 37(3), 547
Causual Inferences In Nonexperimental Research Herman O. A. Wold; Hubert M. Blalock Econometrica 1965 33(4), 879
Methods of Correlation and Regression Analysis, Linear and Curvilinear Herman O. A. Wold; Mordecai Ezekiel; Karl A. Fox Econometrica 1961 29(2), 256