Takeuchi, Y. <https://pure.iiasa.ac.at/view/iiasa/2766.html>  (1990).  On the decompositions of observations with non-Gaussian additive noise and their innovations processes.    In:  Analysis and Optimization of Systes. Eds. Bensoussan, A. & Lions, J.L., pp. 248-257 Germany: Springer Berlin Heidelberg.  ISBN 978-3-540-47085-4 10.1007/BFb0120047 <https://doi.org/10.1007/BFb0120047>.