A. Nastasi: Neumann p-Laplacian problems with a reaction term on metric spaces RICERCHE DI MATEMATICA 2020 A. Nastasi, C. Pacchiano Camacho: Regularity properties for quasiminimizers of a $(p,q)$-Dirichlet integral CALCULUS OF VARIATIONS AND PARTIAL DIFFERENTIAL EQUATIONS Vol. 60, 2021 A. Nastasi, C. Pacchiano Camacho: Higher integrability and stability of $(p,q)$-quasiminimizers Journal of Differential Equations Vol. 342, p. 121-149, 2022 J. Kinnunen, A. Nastasi, C. Pacchiano Camacho: Gradient higher integrability for double phase problems on metric measure spaces Proceedings of the AMS Vol. 152, p. 1233-1251, 2024 A. Nastasi, C. Pacchiano Camacho: Regularity results for quasiminima of a class of double phase problems MATHEMATISCHE ANNALEN 2024