JOCKUSCH, Carl G. ,. Jr. A Reducibility Arising from the Boone Groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 31, p. 262–266, 1972. DOI: 10.7146/math.scand.a-11433. Disponível em: https://journals.msp.org/mscand/article/view/2211. Acesso em: 25 jul. 2026.