Combinatorics via closed orbits: number theoretic Ramanujan graphs are not unique neighbor expanders. - Amitay Kamber; Tali Kaufman (STOC, 2022)

Cutoff on graphs and the Sarnak-Xue density of eigenvalues. - Konstantin Golubev; Amitay Kamber (Eur. J. Comb., 2022)