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Dec 26, 2010 at 14:14 comment added Daniel Moskovich Thanks! I'm in the position of having to give the maximally annoying comment of "you answered what I asked but not what I meant." I apologise! I didn't write the question very well (I will now edit the question)... I suppose I'm primarily after the ring structure. How do I calculate that? (a modern reference is a good answer as well.)
Dec 26, 2010 at 14:11 history edited Mariano Suárez-Álvarez CC BY-SA 2.5
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Dec 26, 2010 at 14:03 history edited Mariano Suárez-Álvarez CC BY-SA 2.5
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Dec 26, 2010 at 13:54 history answered Mariano Suárez-Álvarez CC BY-SA 2.5