%0 Journal Article %A W. Steven Gray %T Entropy of Generating Series for Nonlinear Input-Output Systems and Their Interconnections %J Symmetry, integrability and geometry: methods and applications %D 2022 %V 18 %U http://geodesic.mathdoc.fr/item/SIGMA_2022_18_a81/ %G en %F SIGMA_2022_18_a81