Need recommendation for a good Kerberos book/guide
I'm new to Kerberos and am struggling through it, mainly by reading O'Reillys "Kerberos: The Definitive Guide". I must say I'm very dissatisfied about this book. It's very shallow when it comes to implementation, I'm having difficulties understanding things. Also, who needs a kerberized telnet or something. I want guides that feature implementations of Kerberos on more modern services.
With that in mind, and the fact that I'm struggling with the MIT version of KRB5, which (e)book would you recommend me to read?
Thanks in advance for any tip.