KAIJSER, S. A New Proof of the Fundamental Lemma of Interpolation Theory. MATHEMATICA SCANDINAVICA, [S. l.], v. 78, p. 266–270, 1996. DOI: 10.7146/math.scand.a-12588. Disponível em: https://tidsskrift.dk/math/article/view/12588. Acesso em: 14 aug. 2026.