K. V. R. SRINIVAS. Characterisation of Semigroups and Rings. Characterisation of Semigroups and Rings, [S. l.], p. 1, 2023. DOI: 10.9734/bpi/mono/978-81-19491-82-7/CH0. Disponível em: https://stm.bookpi.org/CSR/article/view/11641. Acesso em: 13 jun. 2026.