Below are the links to sources containing information about the use of some of the 2-wire buses which are supported by 2-wire bus buffers.
Philips I2C Specifications (pdf)
MCC-US - Tecnical Overview (pdf)
I2C FAQ
Total Phase - I2C Background
Embedded.com - Introduction to I2C
Embedded Systems Academy - Technical Overview & FAQ
SMBus.org – Specifications
Maxim – Application Note
Interface Bus – General Info
MSC – Differences between I2C, Access.bus, and SMBus
PMBus.info – Index
PMBus.info - Specifications
MCC-US – Access.bus specification
Interface Bus – General Access.bus information
http://www.i2cchip.com/
http://www.mcc-us.com/
http://www.electronicstalk.com/guides/i2c.html
http://www.planetee.com/
http://www.thomasnet.com/
http://www.electronicstalk.com/
http://www.ferret.com.au