- N. K. Smolentsev, “Diffeomorphism groups of compact manifolds”, J Math Sci, 146, № 6, 2007,
6213 
- O. V. Troshkin, “Nonlinear stability of a parabolic velocity profile in a plane periodic channel”, Comput. Math. and Math. Phys., 53, № 11, 2013,
1729 - Hasan Gümral, “Helicity invariants in 3D: kinematical aspects”, Physica D: Nonlinear Phenomena, 139, № 3-4, 2000,
335