resources for learning maxima



Hi,

I have been using Maxima for simple calculations in the past week or
so, and I find it really useful.  I would like to learn it better, and
I am looking for recommendations on what books/articles to read.

Primarily, I am planning to use Maxima as an "algebra notebook", ie
most of the time I would like to guide it through computations that I
could do myself, but it is really nice to have a tool that keeps track
of manipulations and ensures that they are correct.

Best,

Tamas