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, F. Leonetti, G. Treu:
Nonoccurrence of Lavrentiev gap for a class of functionals with nonstandard growth
Advances in Nonlinear Analysis Vol. 13, N. 1, 2024

F. De Filippis, M. Piccinini:
Regularity for multi-phase problems at nearly linear growth
J. Differential Equations 2024