1) T. Kailath: A General Likelihood-Ratio Formula for Random Signals, IEEE Trans. on Information Theory, IT-15-3, 350/361 (1969)
2) T. Kailath: Likelihood Ratios for Gaussian Processes, IEEE Trans. on Information Theory, IT-16-3, 276/288 (1970)
3) T. Kailath: A Further Note on a General Likelihood Formula for Random Signals in Gaussian Noise, IEEE Trans. on Information Theory, IT-16-4, 393/396 (1970)
4) R. L. Stratonovich: Detection and Estimation of Signals in Noise When One or Both are Non-Gaussian, Proc. IEEE, 58-5, 670/679 (1970)
5) T. E. Duncan: Likelihood Functions for Stochastic Signals in White Noise, Information and Control, 16, 303/310 (1970)