Documentation for the imregdemons-function for non rigid image registration

I am using the imregdemons-function in my master thesis and I need to know which mathematical methods is being used by the function.

Spesifically I need to know :

1. which distance measure is being used.
2. which regularizer is being used
3. which optimization method is being used.

I am looking for some kind of documentation or a verification of this to be used as documentation in my thesis.

[Eirik Kvernevik]

anyone in the matlab support team that can help me here ?