CHEN, MING-PO, and SHIGEYOSHI OWA. “ON A CERTAIN CONVOLUTION OPERATOR FOR MEROMORPHIC FUNCTIONS”. Tamkang Journal of Mathematics 25, no. 3 (September 1, 1995): 209–216. Accessed April 26, 2024. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/4444.