Exponentially many graphs have a Q-cospectral mate. - João Carvalho; Bruna S. Souza; Vilmar Trevisan; Fernando Tura (Discret. Math., 2017)

Determining graphs by the complementary spectrum. - K. Pinheiro; Bruna S. Souza; Vilmar Trevisan (Discuss. Math. Graph Theory, 2020)