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Subclassification references

• Daisuke Sasaki 2007
• Fischer, Susan and Gong, Qunhu 2010
• Woll, Bencie and Sutton-Spence, R. and Elton, F. 2001
• Keiko Sagara and Ritsuko Kikusawa 2019
• Soya Mori 2016

Comments on subclassification

Historical and lexical evidence ( Soya Mori 2016: 802-803 , Fischer, Susan and Gong, Qunhu 2010 , Keiko Sagara and Ritsuko Kikusawa 2019 , Woll, Bencie and Sutton-Spence, R. and Elton, F. 2001: 29 , Daisuke Sasaki 2007 ).