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Published online by Cambridge University Press: 25 April 2016
This is a summary of the essential work that was published since the previous report (Young 1994), Reports on Astronomy Vol XXIIA, 229-238. This summary is not a complete review, and it certainly does not cover papers that appeared during the last couple of months. References are in terms of volume and reference number in Astronomy and Astrophysics Abstracts, and papers with no such citation numbers are given with their full bibliographic reference.