Malamud, M. M., and R. Zuidwijk. “Simultaneous Similarity of Pairs of Convolution Volterra Operators to Fractional Powers of the Operator of Integration”. Methods of Functional Analysis and Topology 9, no. 2 (June 25, 2003): 154–162. Accessed December 17, 2025. https://zen.imath.kiev.ua/index.php/mfat/article/view/211.