G. Citti, A. Sarti:
A cortical based model of perceptual completion in the rototraslation space
(Submitted Paper) 2004

G. Citti, M. Manfredini, A. Pinamonti, F. Serra Cassano:
Smooth approximation for intrinsic Lipschitz functions in the Heisenberg group
Calc. Var. Partial Differential Equations  (Accepted Paper) 2013

G. Citti, M. Manfredini, A. Pinamonti, F. Serra Cassano:
Poincaré-type inequality for Lipschitz continuous vector fields
JMPA (Accepted Paper) 2013

L. Capogna, G. Citti, E. Le Donne, A. Ottazzi:
Conformality and $Q$-harmonicity in sub-Riemannian manifolds
p. 64, 2016

A. Baldi, G. Citti, G. Cupini:
Schauder estimates at the boundary for sub-laplacians in Carnot groups
Calc. Var. Partial Differential Equations (Accepted Paper) 2019

G. Citti, S. Mukherjee:
Regularity of quasi-linear equations with Hormander vector fields of step two
Advances in Mathematics p. 46, 2022

G. Citti, B. Stroffolini:
Internal Schauder estimates for H\"ormander type equations with Dini continuous source
(Preprint) 2023