@article{DCG_1989__4_6_131083,
     author = {H. Edelsbrunner},
     title = {The {Upper} {Envelope} of {Piecewise} {Linear} {Functions:} {Tight} {Bounds} on the {Number} of {Faces.}},
     journal = {Discrete & computational geometry},
     pages = {337--344},
     publisher = {mathdoc},
     volume = {4},
     number = {6},
     year = {1989},
     zbl = {0707.68043},
     url = {http://geodesic.mathdoc.fr/item/DCG_1989__4_6_131083/}
}