@incollection{MEM_2010_39_1_a25,
     author = {Staynova, Petra},
     title = {A {Problem} on {Infinite} {Series:} {Difficult} or {Easy?}},
     booktitle = {},
     series = {Mathematics and Education in Mathematics},
     pages = {237--242},
     year = {2010},
     volume = {39},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MEM_2010_39_1_a25/}
}