@article{FORUM_1992__4_6_141676,
     author = {Yuan Wang and Eduardo D. Sontag},
     title = {Generating series and nonlinear systems: {Analytic} aspects, local realizability, and i/o representations.},
     journal = {Forum mathematicum},
     pages = {299--322},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1992},
     zbl = {0746.93020},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1992__4_6_141676/}
}