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spglib,
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http://stokes.byu.edu/iso/findsym.php
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http://www.cryst.chem.uu.nl/spek/platon/

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https://github.com/msg-byu/symlib
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Acta Cryst. (1999). A55, 383-395
Algorithms for deriving crystallographic space-group information
R. W. Grosse-Kunstleve

Algorithms for deriving crystallographic space-group information. II. Treatment of special positions
R. W. Grosse-Kunstleve and P. D. Adams
http://scripts.iucr.org/cgi-bin/paper?au0265
Acta Cryst. (2002). A58, 60-65

Nonequivalent periodic subsets of the lattice
W. Cocke
Acta Cryst. (2013). A69, 440¨C444
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spglib,
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