@article{PORMA_1991__48_1_115740,
     author = {Haukkanen, Pentti and McCarthy, Paul J.},
     title = {Sums of values of even functions},
     journal = {Portugaliae mathematica},
     pages = {53--66},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1991},
     mrnumber = {1107258},
     zbl = {0725.11002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1991__48_1_115740/}
}