KISIL, V. V. Erlangen Programme at Large 3.2 Ladder Operators in Hypercomplex Mechanics. Acta Polytechnica, [S. l.], v. 51, n. 4, 2011. DOI: 10.14311/1402. Disponível em: https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1402.. Acesso em: 22 jul. 2025.