Iancu, C., T. Oproiu, A. Pop, and V. Pop. “On the Cauchy Transform and Complex Cubic Splines”. Rev. Anal. Numér. Théor. Approx., vol. 32, no. 1, Feb. 2003, pp. 63-68, https://ictp.acad.ro/jnaat/journal/article/view/2003-vol32-no1-art6.