CALL, Frederick W. A Theorem of Grothendieck Using Picard Groups for the Algebraist. Mathematica Scandinavica, Berkeley, CA, United States, v. 74, p. 161–183, 1994. DOI: 10.7146/math.scand.a-12487. Disponível em: https://journals.msp.org/mscand/article/view/1140. Acesso em: 25 jul. 2026.