@article{ELMA_1993__48_4_141546,
     author = {Hans-J\"urgen Fischer},
     title = {Die {Summe} der {Reziproken} der nat\"urlichen {Zahlen} ohne {Ziffer} 9.},
     journal = {Elemente der Mathematik},
     pages = {100--106},
     publisher = {mathdoc},
     volume = {48},
     number = {4},
     year = {1993},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1993__48_4_141546/}
}