@article{10_4064_ap_26_2_199_204,
     author = {Marek Kuczma},
     title = {On a certain series},
     journal = {Annales Polonici Mathematici},
     pages = {199--204},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1972},
     doi = {10.4064/ap-26-2-199-204},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-26-2-199-204/}
}