MUIR, JR. , Jerry R. Linear invariance and extension operators of Pfaltzgraff–Suffridge type. Studia Universitatis Babeș-Bolyai Mathematica, [S. l.], v. 67, n. 2, p. 295–308, 2022. DOI: 10.24193/subbmath.2022.2.06. Disponível em: https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/1484. Acesso em: 5 feb. 2025.