G. V. Mikaelyan and Z. S. Mikaelyan, “WEIERSTRASS AND BLASCHKE TYPE FUNCTIONS”, Proc. YSU A: Phys. Math. Sci., vol. 44, no. 1 (221), pp. 3–8, Jan. 2010, doi: 10.46991/PYSUA.2010.44.1.003.