@article{COCV_2003__9__509_0,
     author = {Busvelle, \'Eric and Gauthier, Jean-Paul},
     title = {On determining unknown functions in differential systems, with an application to biological reactors},
     journal = {ESAIM: Control, Optimisation and Calculus of Variations},
     pages = {509--551},
     publisher = {EDP-Sciences},
     volume = {9},
     year = {2003},
     doi = {10.1051/cocv:2003025},
     mrnumber = {1998713},
     zbl = {1063.93011},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/cocv:2003025/}
}