F. De Filippis, F. Leonetti, P. Marcellini, E. Mascolo:
The Sobolev class where a weak solution is a local minimizer
Rendiconti Lincei - Matematica e Applicazioni Vol. 34, N. 2, p. 451-463, 2023

F. De Filippis, F. Leonetti:
No Lavrentiev gap for some double phase integrals
Advances in Calculus of Variations Vol. 17, N. 1, p. 165-194, 2024

M. Borowski, I. Chlebicka, F. De Filippis, B. Miasojedow:
Absence and presence of Lavrentievs phenomenon for double phase functionals upon every choice of exponents
Calculus of Variations and Partial Differential Equations Vol. 63, 2024

F. De Filippis, M. Piccinini:
Regularity for multi-phase problems at nearly linear growth
(Submitted Paper) 2024