Where Can I Find Discussion of Coke Versus Bottlers Business Models?

[persistentone3]

Coke is one of Berkshire's defining investments.  Some of the reasons that Warren Buffett thought Coke was a perfect company was that it has low capital expenditures to support additional sales together with high barriers to entry and high consumer level brand awareness.  Where can I find a good business model discussion that compares the economics of the Coke company against the economics of its bottlers?  Obviously this will be primarily a comparison of capital costs required to support growth.  If someone could post a URL to some good discussion that includes specific numbers about required capex for each business type (Coke versus prototypical bottler) I would enjoy reading that.