Field-induced non-linear optical features of p-aminoazobenzene crystals V. Krishnakumar, G. Eazhilarasi, R. Nagalakshmi, M. Piasecki, I. V. Kityk and P. Bragiel Eur. Phys. J. Appl. Phys., 42 3 (2008) 263-267 Published online: 30 April 2008 DOI: 10.1051/epjap:2008056