Sobhy EL-SAYED IBRAHIM. Studies on the Domains of Regularly Solvable Operators in the Direct Sum Spaces. Recent Advances in Mathematical Research and Computer Science Vol. 6, [S. l.], p. 111–131, 2022. DOI: 10.9734/bpi/ramrcs/v6/13558D. Disponível em: https://stm.bookpi.org/RAMRCS-V6/article/view/5315. Acesso em: 24 jun. 2026.