Börger, Egon, Uwe Glässer, and Wolfgang Müller. “A Formal Definition of an Abstract VHDL’93 Simulator by EA-Machines.”https://doi.org/10.1007/978-1-4615-2237-9_5__In Semantics of VHDL, edited by C. Delgado Kloos and Peter T. Breuer, 107–39. Dordrecht: Kluwer Academic Publishers, 1995.https://doi.org/10.1007/978-1-4615-2237-9_5 .

Lasser, R., and Margit Rösler. “Linear Mean Estimation of Weakly Stationary Stochastic Processes under the Aspects of Optimality and Asymptotic Optimality.”https://doi.org/10.1016/0304-4149(91)90095-t__Stochastic Processes and Their Applications 38, no. 2 (1991): 279–93.https://doi.org/10.1016/0304-4149(91)90095-t .