Crispo, F., C. Romano Grisanti, and P. Maremonti. “Singular P-Laplacian Parabolic System in Exterior Domains: Higher Regularity of Solutions and Related Properties of Extinction and Asymptotic Behavior in Time”. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, vol. 19, no. 3, Sept. 2019, pp. 913-49, doi:10.2422/2036-2145.201703_019.