Oscar Lange's Liberal Socialist Model

Answers can be in point form if its easier for you.  I'm just trying to gain some knowledge on this, as I want to be able to take part in class discussions and possibly write an essay.

Who is Oscar Lange?

What is the Basis (or summary) of Oscar Lange's Liberal Socialist Model?

What are the strong and weak points of Oscar Lange's Liberal Socialist model?

What are the strong and weak points of this model from an economic perspective? (with possible comparisons to capitalism if possible)

Also what are some books related to this subject, so I could read up on this as well.