Raiţă, Bogdan Max Planck Institute for Mathematics in the Sciences, Max Planck Society;
Raiţă, B., & Skorobogatova, A. (2020). Continuity and canceling operators of order n on Rn. Calculus of variations and partial differential equations, 59(2): 85. doi:10.1007/s00526-020-01739-z.