A high-tech proof of the Mills-Robbins-Rumsey determinant formula. Petkovšek, Marko; Wilf, Herbert S. — 1996 The Electronic Journal of Combinatorics [electronic only]
When can the sum of ( 1 / p ) th of the binomial coefficients have closed form. Petkovšek, Marko; Wilf, Herbert S. — 1997 The Electronic Journal of Combinatorics [electronic only]