@article{JGG_2018_22_1_JGG_2018_22_1_a9,
     author = {A. Gfrerrer and J. Lang },
     title = {Fully {Variable} {Valve} {Control:} {A} {Geometric} {Approach}},
     journal = {Journal for geometry and graphics},
     pages = {99--114},
     publisher = {mathdoc},
     volume = {22},
     number = {1},
     year = {2018},
     url = {http://geodesic.mathdoc.fr/item/JGG_2018_22_1_JGG_2018_22_1_a9/}
}