Imaging of the Ferroelectric Domain Structures by Confocal Raman Spectroscopy
G. Berth, W. Hahn, V. Wiedemeier, A. Zrenner, S. Sanna, W.G. Schmidt, Ferroelectrics 420 (2011) 44–48.

Imaging of Ferroelectric Micro-Domains in X-Cut Lithium Niobate by Confocal Second Harmonic Microscopy
G. Berth, V. Wiedemeier, K.-P. Hüsch, L. Gui, H. Hu, W. Sohler, A. Zrenner, Ferroelectrics 389 (2009) 132–141.