%0 Journal Article %T ON GROUP‐THEORETIC DECISION PROBLEMS AND THEIR CLASSIFICATION %A Clapham, C. R. J. %J Bulletin of the London Mathematical Society %V 6 %N 1 %P 117-118 %@ 0024-6093 %D 1974-03-01 %I Wiley Subscription Services, Inc., A Wiley Company %~ DeepDyve