BOMAN, J. Differentiability of a Function and of its Compositions with Functions of One Variable. MATHEMATICA SCANDINAVICA, [S. l.], v. 20, p. 249–268, 1967. DOI: 10.7146/math.scand.a-10835. Disponível em: https://www.mscand.dk/article/view/10835. Acesso em: 28 apr. 2024.