Petkovšek M, Wilf HS. When can the sum of $(1/p)$th of the binomial coefficients have closed form?. Electron. J. Combin. [Internet]. 1996Nov.25 [cited 2026May29];4(2):#R21. Available from: https://www.combinatorics.org/ojs/index.php/eljc/article/view/v4i2r21