By Thomson M. R. A.   Vaughan Alan P. M.   in Archives of Natural History

ISSN:1755-6260|32|2|362-393

Edinburgh University Press‎(2005)‎

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By Robertson E. F.   Rusˇkuc N.   Thomson M. R.   in Communications in Algebra

ISSN:0092-7872|30|8|3851-3873

Taylor & Francis Ltd‎(2002)‎

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