@incollection{AST_1975__24-25__281_0,
     author = {Halberstam, Heini},
     title = {A proof of {Chen's} theorem},
     booktitle = {Journ\'ees arithm\'etiques de Bordeaux},
     series = {Ast\'erisque},
     pages = {281--293},
     publisher = {Soci\'et\'e math\'ematique de France},
     number = {24-25},
     year = {1975},
     mrnumber = {389815},
     zbl = {0307.10048},
     language = {en},
     url = {http://www.numdam.org/item/AST_1975__24-25__281_0/}
}