@article{GDZPPN000364053,
title = {The Upper Envelope of Piecewise Linear Functions: Tight Bounds on the Number of Faces.},
journal = {Discrete \& computational geometry},
volume = {4},
year = {1989},
pages = {337-344},
zbl = {0707.68043},
url = {http://dml.mathdoc.fr/item/GDZPPN000364053}
}
Edelsbrunner, H. The Upper Envelope of Piecewise Linear Functions: Tight Bounds on the Number of Faces.. Discrete & computational geometry, Tome 4 (1989) pp. 337-344. http://gdmltest.u-ga.fr/item/GDZPPN000364053/