@unpublished{GugatHabermannHintermuelleretal.2021, author = {Martin Gugat and Jens Habermann and Michael Hinterm{\"u}ller and Olivier Huber}, title = {Constrained exact boundary controllability of a semilinear model for pipeline gas flow}, institution = {Friedrich-Alexander-Universit{\"a}t Erlangen-N{\"u}rnberg}, year = {2021}, }