@article{10_4064_aa127_1_1,
     author = {E. Nazarewicz and M. O'Brien and M. O'Neill and C. Staples},
     title = {Equality in {Pollard's} theorem on
 set addition of congruence classes},
     journal = {Acta Arithmetica},
     pages = {1--15},
     publisher = {mathdoc},
     volume = {127},
     number = {1},
     year = {2007},
     doi = {10.4064/aa127-1-1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa127-1-1/}
}