Chen, Z., C.-S. Lin, and W. Zou. “Infinitely Many Sign-Changing and Semi-Nodal Solutions for a Nonlinear Schrödinger System ”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, vol. 15, no. special, Feb. 2016, pp. 859-97, doi:10.2422/2036-2145.201401_002.