@article{PORMA_1997__54_4_48102,
     author = {Haukkanen, P. and Ruokonen, P.},
     title = {On an analogue of completely multiplicative functions.},
     journal = {Portugaliae mathematica},
     pages = {407--420},
     publisher = {mathdoc},
     volume = {54},
     number = {4},
     year = {1997},
     zbl = {0910.11002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1997__54_4_48102/}
}