METSÄNKYLA, Tauno. Note on a congruence for $p$-adic $L$-functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 57, p. 225–235, 1985. DOI: 10.7146/math.scand.a-12114. Disponível em: https://journals.msp.org/mscand/article/view/1550. Acesso em: 25 jul. 2026.