K. V. R. SRINIVAS; Y. L. ANASUYA. Partial Orders in Regular Semigroups. Characterisation of Semigroups and Rings, [S. l.], p. 2–7, 2023. DOI: 10.9734/bpi/mono/978-81-19491-82-7/CH1. Disponível em: https://stm.bookpi.org/CSR/article/view/11643. Acesso em: 19 jun. 2026.