Word maps and spectra of random graph lifts. - Nati Linial; Doron Puder (Random Struct. Algorithms, 2010)

Growth of primitive elements in free groups. - Doron Puder; Conan Wu (J. Lond. Math. Soc., 2014)

Ramanujan coverings of graphs. - Chris Hall; Doron Puder; William F. Sawin (STOC, 2016)