A. Kowalski, D. Szynal, “Filtering in Discrete-Time Systems with State and Observation Noises Correlated on a Finite Time Interval”, IEEE Transactions on Automatic Control, AC-31 (1986), 381–384
A. Kowalski, D. Szynal, “On State Estimation and Control in Discrete-Time Systems on Linear Type”, Automatica, 24:6 (1988), 841–843
A. Kowalski, D. Szynal, “On Optimal Prediction in Nonstationary ARMA Models”, Scandinavian Journal of Statistics, 15:2 (1988), 111–116
A. Kowalski, E. Rudiuk, “Correlation in L^p-spaces”, J. Multivariate Anal., 96:1 (2005), 20–29
A. Kowalski, E. Rudiuk, “$L^p$-quantile correlation”, Amer. J. Math. Management Sci., 24:3-4 (2004), 255–278