Ergodic theorems for superadditive processes. U. Krengel; M.A. Akcoglu — 1981 Journal für die reine und angewandte Mathematik
Approximation of L 2 -processes by Gaussian processes. Akcoglu, M.A.; Baxter, J.R.; Ha, D.M.; Jones, R.L. — 1998 The New York Journal of Mathematics [electronic only]