Irreducible representations of simple Lie algebras by differential operators A. Morozov, M. Reva, N. Tselousov and Y. Zenkevich Eur. Phys. J. C, 81 10 (2021) 898 Published online: 12 October 2021 DOI: 10.1140/epjc/s10052-021-09676-7