Periodic representations and rational approximations of square roots. - Marco Abrate; Stefano Barbero; Umberto Cerruti; Nadir Murru (J. Approx. Theory, 2013)

Colored compositions, Invert operator and elegant compositions with the "black tie". - Marco Abrate; Stefano Barbero; Umberto Cerruti; Nadir Murru (Discret. Math., 2014)

Polynomial Sequences on Quadratic Curves. - Marco Abrate; Stefano Barbero; Umberto Cerruti; Nadir Murru (Integers, 2015)