ULBRICH, K. -h. On modules induced or coinduced from Hopf subalgebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 67, p. 177–182, 1990. DOI: 10.7146/math.scand.a-12328. Disponível em: https://journals.msp.org/mscand/article/view/1346. Acesso em: 24 jul. 2026.