@article{PORMA_1999__56_3_48440,
     author = {Haukkanen, P.},
     title = {Rational arithmetical functions of order (2,1) with respect to regular convolutions.},
     journal = {Portugaliae mathematica},
     pages = {329--343},
     publisher = {mathdoc},
     volume = {56},
     number = {3},
     year = {1999},
     zbl = {0939.11003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1999__56_3_48440/}
}