RAO, N. V. A Note on Tolstov’s Theorem on Harmonic Functions in the Plane. MATHEMATICA SCANDINAVICA, [S. l.], v. 78, p. 178–182, 1996. DOI: 10.7146/math.scand.a-12581. Disponível em: https://www.mscand.dk/article/view/12581. Acesso em: 5 may. 2024.