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Laffont, Jean-Jacques (1977) A Note on the Cramer-Rao Bound in Non Linear Systems. Annals of Social and Economic Measurement, 6 (4). pp. 445-451.
Jorgenson, Dale W. and Laffont, Jean-Jacques (1974) Efficient Estimation of Nonlinear Simultaneous Equations with Additive Disturbances. Annals of Social and Economic Measurement, 3 (4). pp. 615-640.