There are several books on RSA that compliment the material in this work. These include:
• Katzenbeisser  • Mollin  • Yan 
There have been several PhD dissertations that focus on RSA or variants of RSA. Often, the presentation in these is more verbose and descriptive, compared to published results, and may be of interest. Some of these include:
• Joye  • Howgrave-Graham  • Coron  • Durfee  • May  • Hinek  • Jochemsz  • Wu  In addition, most of the main conferences in cryptography have their pro-
ceedings published in Springer’s Lecture Notes in Computer Science series. This is an excellent source for most research in cryptography in general.