Soltés, V. ., and O. F. S. . Amaitiek. “The Short Put Ladder Strategy and Its Application in Trading and Hedging”. Theory, Methodology, Practice – Review of Business and Management, vol. 6, no. 02, Dec. 2010, pp. 77-84, https://ojs.uni-miskolc.hu/index.php/tmp/article/view/1366.