@article{10_4064_aa107_2_2,
     author = {Trevor D. Wooley},
     title = {The difficulty of the local solubility problem
 for additive equations},
     journal = {Acta Arithmetica},
     pages = {127--156},
     publisher = {mathdoc},
     volume = {107},
     number = {2},
     year = {2003},
     doi = {10.4064/aa107-2-2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa107-2-2/}
}