BOMAN, Jan. Differentiability of a Function and of its Compositions with Functions of One Variable. Mathematica Scandinavica, Berkeley, CA, United States, v. 20, p. 249–268, 1967. DOI: 10.7146/math.scand.a-10835. Disponível em: https://journals.msp.org/mscand/article/view/2491. Acesso em: 25 jul. 2026.