Shells 
Joint variation of parameters (4)
4. Helicoidal angles and lengths of ellipse axes: \(\alpha\), \(\beta\), \(a\) and \(b\)
4. Helicoidal angles and lengths of ellipse axes: \(\alpha\), \(\beta\), \(a\) and \(b\)
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Created on: 2007
Last update: 2021-02-26 09:10:30+0000
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