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Optical crystallographic study of piezoelectric KxNa1−xNbO3 (x = 0.4, 0.5 and 0.6) single crystals using linear birefringence
Gupta, Shashaank.  CrystEngComm.  v. Volume 15. no. Number 34.   2013-09. p. 6790 - 6799... issn: 1466-8033 .   

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