History of the aorist

Dear group

As I wrote in my introductory post, I'm a beginner, and don't have any
knowledge of Sanskrit.

In Narada's course, the aorist is just presented "as-is", with a few
remarks that sometimes the base, and sometimes the stem is used to
construct it, and that sometimes, an s is inserted, and sometimes, an a
is prefixed.

In Duroiselle's grammar the treatment is more detailed, hinting at a
complex historical process leading to the Pali aorist.

Collins' grammar is very terse on the subject of the history of the aorist.

I'd be grateful for any suggestions on what's worth knowing about the
aorist's development, and where to find out more about it.

Kind regards,
Florian