Zhu, Operator Theory in Function Spaces, vol. 139 of authors and models in Pure and Applied Mathematics, Marcel Dekker, New York, NY, USA, 1990. Journal of Mathematical Analysis and Applications, vol. Glasgow Mathematical Journal, vol. View at Zentralblatt MATHJ. Reine deal Angewandte Mathematik, vol. View at Zentralblatt MATHJ. Xiao, Holomorphic Q Classes, vol. 1767 of Lecture Notes in Mathematics, Springer, Berlin, Germany, 2001.