1. Theory of reproducing kernels
2. Saitoh S. Theory of reproducing kernels and its applications. England: Longman Scientific & Technical; 1988. p. 188. (Pitman research notes in mathematics series).
3. Saitoh S. Integral transforms, reproducing kernels and their applications. Addison Wesley Longman; 1997. p. 369. (Pitman research notes in mathematics series).
4. Nikolski NK. Operators, functions and systems: an easy reading. Volume I: Hardy, Hankel and Toeplitz. Dearborn: American Mathematical Society; 2002. (Mathematical surveys and monographs; vol. 92).