CALL, Frederick W. A Theorem of Grothendieck Using Picard Groups for the Algebraist. MATHEMATICA SCANDINAVICA, [S. l.], v. 74, p. 161–183, 1994. DOI: 10.7146/math.scand.a-12487. Disponível em: https://tidsskrift.dk/math/article/view/12487. Acesso em: 13 aug. 2026.