Dovgoshey, A. A. “Continual Sets With the Dirichlet Properties and Products of Hardy Spaces”. Ukrains’kyi Matematychnyi Zhurnal 44, no. 10 (October 1, 1992): 1337–1341. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/8229.