Mureşan, Anton S. “Some Properties of Solutions of Equation \(\Delta^{\prime}u=0\)”. Anal. Numér. Théor. Approx. 8, no. 2 (August 1, 1979): 187–192. Accessed November 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/1979-vol8-no2-art9.