DALE, Magnar. Embedding-obstruction for products of non-singular, projective varieties. Mathematica Scandinavica, Berkeley, CA, United States, v. 44, p. 278–288, 1979. DOI: 10.7146/math.scand.a-11810. Disponível em: https://journals.msp.org/mscand/article/view/1837. Acesso em: 25 jul. 2026.