Counting Pairs of Lattice Paths by Intersections. - Ira M. Gessel; Wayne Goddard; Walter Shur; Herbert S. Wilf; Lily Yen (J. Comb. Theory A, 1996)

Even and Odd Pairs of Lattice Paths with Multiple Intersections. - Ira M. Gessel; Walter Shur (J. Comb. Theory A, 1996)

The Last Digit of (2n choose n) and Sigma(n choose i)(2n-2i choose n-i). - Walter Shur (Electron. J. Comb., 1997)