  We consider the problem of transmission of several distributed sources over a
multiple access channel (MAC) with side information at the sources and the
decoder. Source-channel separation does not hold for this channel. Sufficient
conditions are provided for transmission of sources with a given distortion.
The source and/or the channel could have continuous alphabets (thus Gaussian
sources and Gaussian MACs are special cases). Various previous results are
obtained as special cases. We also provide several good joint source-channel
coding schemes for a discrete/continuous source and discrete/continuous
alphabet channel. Channels with feedback and fading are also considered.
  Keywords: Multiple access channel, side information, lossy joint
source-channel coding, channels with feedback, fading channels.
