@article{MAN_1965__162_161320,
     author = {E. H\"ARTTER},
     title = {\"Uber den {Dichtebegriff} in der additiven {Zahlentheorie.}},
     journal = {Mathematische Annalen},
     pages = {27--53},
     publisher = {mathdoc},
     volume = {162},
     year = {1965},
     zbl = {0135.09601},
     url = {http://geodesic.mathdoc.fr/item/MAN_1965__162_161320/}
}