@article{10_4064_aa110_3_2,
     author = {Patrick Sargos},
     title = {An analog of van der {Corput's} $A^{4}$-process  for exponential sums},
     journal = {Acta Arithmetica},
     pages = {219--231},
     publisher = {mathdoc},
     volume = {110},
     number = {3},
     year = {2003},
     doi = {10.4064/aa110-3-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa110-3-2/}
}