Michałek, Mateusz Max Planck Institute for Mathematics in the Sciences, Max Planck Society;
Qi, Y., Michałek, M., & Lim, L.-H. (2020). Complex best r-term approximations almost always exist in finite dimensions. Applied and computational harmonic analysis, 49(1), 180-207. doi:10.1016/j.acha.2018.12.003.