Second harmonic generation from the 'centrosymmetric' crystals
IUCrJ (2015) - Comments
pubmed: 25995840  doi: 10.1107/s2052252515002183  issn: 2052-2525 

Venkatram Nalla, Raghavender Medishetty, Yue Wang, Zhaozhi Bai, Handong Sun, Ji. Wei, Jagadese J. Vittal