@article{ITA_1979__13_2_107_0,
     author = {Ehrig, H. and K\"uhnel, W.},
     title = {Categorical approach to nonlinear constant continuous-time systems},
     journal = {RAIRO. Informatique th\'eorique},
     pages = {107--133},
     publisher = {EDP-Sciences},
     volume = {13},
     number = {2},
     year = {1979},
     mrnumber = {543936},
     zbl = {0417.93008},
     language = {en},
     url = {http://www.numdam.org/item/ITA_1979__13_2_107_0/}
}