@article{MM2_1975__17_154366,
     author = {D. Landers and L. Rogge},
     title = {On {Three} {Problems} {For} {Sequences.}},
     journal = {Manuscripta mathematica},
     pages = {221--226},
     publisher = {mathdoc},
     volume = {17},
     year = {1975},
     zbl = {0314.40001},
     url = {http://geodesic.mathdoc.fr/item/MM2_1975__17_154366/}
}