@article{10_4007_annals_2014_179_2_1,
     author = {Alexander A. Razborov},
     title = {A product theorem in free groups},
     journal = {Annals of mathematics},
     pages = {405--429},
     publisher = {mathdoc},
     volume = {179},
     number = {2},
     year = {2014},
     doi = {10.4007/annals.2014.179.2.1},
     mrnumber = {3152939},
     zbl = {06284342},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2014.179.2.1/}
}