1+2+4+8+…
Mathematics Magazine 56 (5): 307–314. doi:10.2307/2690371. JSTOR 2690371.
Sandifer, Ed (2006年6月). “Divergent series” (PDF). How Euler Did It. MAA Online. 2013年8月31日閲覧。
Sierpińska, Anna (November 1987). “Humanities students and epistemological obstacles related to limits”. Educational Studies in Mathematics 18 (4): 371–396. doi:10.1007/BF00240986. JSTOR 3482354.