Are there any good resources (descriptions, explanations, examples) regarding Jablon's protocol for password authentication using multiple servers, aside from this paper?
I found the book Protocols for Authentication and Key Establishment very promising on the subject of authentication protocols. Specifically, it references two protocols by Jablon (see references 165 and 166 of the book).
You may also find more info in papers that cite Jablon's Protocol.
There are lots of papers on the general topic of password authentification on this web page: