@article{IM_1987__88_143466,
     author = {A. Adolphson and S. Sperber},
     title = {Newton polyhedra and the degree of the {L-function} associated to an exponential sum.},
     journal = {Inventiones mathematicae},
     pages = {555--570},
     year = {1987},
     volume = {88},
     zbl = {0623.12012},
     url = {http://geodesic.mathdoc.fr/item/IM_1987__88_143466/}
}