K. Pichelmann, “Arbeitslose und offene Stellen: The unemployment/vacancy curve. Theoretical foundation and empirical relevance. Studies in empirical economics”, WUG, vol. 19, no. 4, pp. 585–586, Oct. 1993, Accessed: Mar. 23, 2026. [Online]. Available: https://journals.akwien.at/index.php/wug/article/view/1759