@article{10_4064_aa138_2_4,
     author = {Gy\"orgy Elekes},
     title = {On the structure of sets with
 many $k$-term arithmetic progressions},
     journal = {Acta Arithmetica},
     pages = {145--164},
     publisher = {mathdoc},
     volume = {138},
     number = {2},
     year = {2009},
     doi = {10.4064/aa138-2-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa138-2-4/}
}