HYLTÉN-CAVALLIUS, Carl. Some extremal problems for trigonometrical and complex polynomials. MATHEMATICA SCANDINAVICA, [S. l.], v. 3, p. 5–20, 1955. DOI: 10.7146/math.scand.a-10420. Disponível em: https://tidsskrift.dk/math/article/view/10420. Acesso em: 14 aug. 2026.