Blasco, O., M. D. Contreras, S. Díaz-Madrigal, J. Martínez, M. Papadimitrakis, and A. G. Siskakis. “Semigroups of Composition Operators and Integral Operators in Spaces of Analytic Functions”. Annales Fennici Mathematici, vol. 38, no. 1, Feb. 2013, pp. 67-90, doi:10.5186/aasfm.2013.3806.